Bsa a65 problems It also finished a career in the local sand and gravel quarry, and a few years ago he returned to bikes with the restoration of a BSA B25 , his new job as a Jan 20, 2009 · Just to froth the oil a bit more. I've converted the system to 12 volt and done away with the rectifier and fitted a voltage regulator(so no need for a z Nearly every problem members have had with Boyers have been due to the bad crimping which may in time actually destroy the electrics. Aug 5, 2005 · The reason I like to start the bike on its original system is when I installed my first Boyer, I had problems so I switched back to points and the bike starter first kick. Dec 10, 2020 · BSA was, however, fairly conservative with its design philosophy, and only for the 1966 BSA A65 Lightning did the company shows initial leanings toward more simplified design choices. Changing down 4-3 is ok too. I think the red wire maybe the live in and the plain black wire maybe the earth wire,that being the case what are the green and black/white wires for! BSA A65. The stator fitted was a Lucas 47164A (263) and I replaced it with a Wassell (two wire) 10 amp unit supplied by my local spares shop as a direct replacement. Feb 19, 2014 · This is a 1968 BSA A65 Lightning. There is a lot of info available saying that the alloy bodied pumps must be carefully fitted and torqued, Could somebody he May 19, 2013 · Depends on what year BSA you are talking about. after numerous times disasemling the timing side,testing the pump,making sure the the scavange pump is sucking,I removed all the timming side one last time,disasembled the oil pump,cleaned again and reasembled with anaerobic sealer on the pump,ball and spring good,new gaskets insatlled,blew out all Aug 20, 2006 · Let us go back to 1962 when BSA showed both the 500cc A50 Star and the 650cc A65 Star—these were powered by the new unit-construction engine, and the only difference was the bore. Yes it May 12, 2017 · Frame BSA A65 "dry frame" blue print. Along with its 500cc cousin, the BSA A50, the problems that beset the A65 typify much of what went wrong with BSA towards the end of the company. i frequent a BSA forum at britbike. Fill your oil tank, prefill your oil filter (if you have one) with regular May 31, 2013 · Some say, if you're using matching cases and crank, and the bush is carefully installed, line-boring is unnecessary. These quickly wore out & caused lots of problems, and since the crankshaft received its oil supply from this location, the resulting lubrication problems caused engine catastrophic Oct 21, 2012 · I have a 1964 A65 Rocket which has 12 volt electrics and I had some problems with the stator not charging properly when the lights were on due to the wiring being shot. As the multi-cylinder bikes arrived so the pressure could be taken off the twins, and the Lightning was allowed to settle into an almost genteel sports-tourer role while the Rocket 3 took the strain. A mistake some people make is to over tighten the mainshaft nut and deform the sleeve (or the sleeve is a soft aftermarket part) causing the free gear to be stuck away from the fixed gear and will not engage. The top two tings are directional in that they have a chamfer on the back edge of the ring and this should go up. Jun 5, 2019 · Tech Tip: BSA A65 Cranks - Early vs Late By Marc Bergeron (Posted by CBS) I n 1966, BSA 650 model line up (and A50 500 models) where fitted on the drive side with a roller bearing ( 68-0625 ) which replaced the earlier deep groove ball bearing ( 67-1240 ). Jul 22, 2010 · Hi Everybody my '69 is wet sumping. If I disconnect the wires from the pick up to the blue box and tou 2 days ago · Includes bulletin boards and free classified ads for BSA, Triumph, Norton and much more. It is in good shape, restored by a good mechanic. Nov 3, 2010 · Getting the lug welded by a competent welder is important. Look closely at the cylinder base flange for cracks-occasional problem on these. If not, then water getting in through the filler cap or through the clutch cable stanchion - there's supposed to be a rubber boot on that, which is often broken or missing. This problem happens with all throttle openings so it's not the main jets (carbs are Mikuni VM 32s). The usual Rapid guide\valve\spring wear you get on Brit twins will likeky be there,inspect cylinder\piston condition rebore if piston to wall exceeds . USA Tel: (201) 880-0366 | info@britcycle. Yes, the milky look is from water. BSA spent '68 and probably most of '67 re-engineering the front ends of all the high-volume models so that common fork and brake parts could be churned out in at least hundreds of thousands. Jan 12, 2013 · Bear in mind that, by '69, Triumphs and BSA's were using the same forks and front brakes. As well as giving a clean look to the engine, with the pushrod passages part of the cylinder block casting, unit construction reduced the number of places oil could leak from. Mar 1, 2015 · 68’ A65 Lightning “clubman” 71’ A65 Thunderbolt 67’ D10 sportsman (undergoing restoration) 68’ D14 trials (undergoing transformation) 70' A50 Royal Star 67’ A65 Spitfire (awaiting restoration) 72’ A65 Thunderbolt - (Awaiting rebuild into replica A70) 59’ A10 Golden Flash And a few unit twin engines. Always Wrong? No. Longish rides result in the problems getting worse. however, i'm unsatisfied with a few questions, and i've found a few people on this forum to Dec 20, 2013 · To its credit BSA steadily developed the big twins, even though some changes took a long time to filter through to production. Looking at old pictures of the same bike, I realise that the clutch cable is on the left side of the cylinder, whereas mine is running under the tank following the frame tube. Now, please don't think I am arguing,. I am piecing one good one together for a Tribeezaha project; a 500 Triumph frame, BSA engine with RZ Yamaha wheels and forks, and I’m most impressed by the BSA unit 650 engine. I've rebuilded it 2 times already, but the main problem are worn out sliders. Jul 19, 2011 · The key to this problem lies in the U. Sep 12, 2020 · 68’ A65 Lightning “clubman” 71’ A65 Thunderbolt 67’ D10 sportsman (undergoing restoration) 68’ D14 trials (undergoing transformation) 70' A50 Royal Star 67’ A65 Spitfire (awaiting restoration) 72’ A65 Thunderbolt - (Awaiting rebuild into replica A70) 59’ A10 Golden Flash And a few unit twin engines. Feb 2, 2017 · By the way, an A65 cam is 7. The later models used a ball and ramp type, similar to unit engined Triumphs. The machines had a poor 4 days ago · Here's what we know: The bike was assembled with Hasting rings. Left to right: BSA A65 clutch centre with combined shock-absorber; BSA/Triumph clutch locking tool (useful, but not essential); four-spring BSA clutch pressure plate. Sep 30, 2017 · Catalog; For You; Real Classic. Getting 12. Clutch does NOT slip once fully Oct 8, 2010 · Seem to be having trouble with the Boyer Micro Power ignition system on my A65 Lightning engined bobber. Jul 23, 2014 · 80-90W gear oil. Clutch does NOT slip once fully Apr 13, 2014 · I have a 67 BSA A65 that I just drained the fork oil and when I went to fill my tubes up I started putting oil in one of them and when I put about 75cc of oil in it, it started pouring out the top. 003". The pin that pushed on the pushrod cocked in the case. 005 "or taper\out of round exceeds . It was 1970, for example, before the cylinder base was enlarged to permit a larger gasket area and stronger holding-down studs. I tend to think that what he is actually having is a wet sumping problem compounded by the left crank seal possibly being out. Instead of focusing their limited resources on fixing the vibration problems, electrical gremlins, and reliability issues, they Sep 16, 2008 · Britbike forum Forums British Motorcycle specific Brands Bsa bulletin board Starting Problem A65: Forums Calendar Active Threads: New Sponsor post: New FAQ post: Just received a SRM oil pump for an A65. The risk of breaking off and ripping a hole in the frame is real. Posted By: BSA_WM20 Re: BSA A65 won't start after it runs for a while - 09/14/12 11:10 am because unless a nut or bolt was not tightened properly you should not have a mechanical problem after a service. The key here is that it would idle after fiddling. Sep 27, 2014 · 68’ A65 Lightning “clubman” 71’ A65 Thunderbolt 67’ D10 sportsman (undergoing restoration) 68’ D14 trials (undergoing transformation) 70' A50 Royal Star 67’ A65 Spitfire (awaiting restoration) 72’ A65 Thunderbolt - (Awaiting rebuild into replica A70) 59’ A10 Golden Flash And a few unit twin engines. There's no real mystery with a BSA clutch (or any classic British bike clutch). Sep 19, 2008 · Hi Guys,I need some advice concerning Alternator power outputs. They replaced the Boyer which I installed and the new one ran perfectly. try again. after numerous times disasemling the timing side,testing the pump,making sure the the scavange pump is sucking,I removed all the timming side one last time,disasembled the oil pump,cleaned again and reasembled with anaerobic sealer on the pump,ball and spring good,new gaskets insatlled,blew out all 68’ A65 Lightning “clubman” 71’ A65 Thunderbolt 67’ D10 sportsman (undergoing restoration) 68’ D14 trials (undergoing transformation) 70' A50 Royal Star 67’ A65 Spitfire (awaiting restoration) 72’ A65 Thunderbolt - (Awaiting rebuild into replica A70) 59’ A10 Golden Flash And a few unit twin engines. Have just ridden a mates H***a four and S****I Katana 2 weeks back. Having looked at it I have found that when I change gear in the normal way and the lever r Aug 3, 2006 · Last week I wanted to take it beyond 5000 and then this strange problem occured, it will not rev past 5700 in any gear. Jul 14, 2021 · 1971 BSA A65 BIG CHANGES FOR THE 1971 BSA A65 For the 1971 model year, BSA and Triumph changed virtually every item on their big 650 twins, with the exception of the engines. You can tell fro Jan 24, 2021 · Hi - I'm trying to plumb my 1967 BSA A65 for use with a Paul Goff Oil Filter kit. by KC in S. Noticed immediately an issue shifting between 2nd through 4th gear. Im not getting any spark at ther plugs when kicking the engine over. It feels like a rev limiter and this is what I have done trying to cure the problem. May 21, 2012 · Put the TDC tool in the crank; then put a small piece of wood or metal down the plug hole until it touches the piston; remove TDC tool; with the rear wheel off the ground and the transmission in 3rd or 4th gear, nudge the rear wheel backwards just enough so that the piece of wood on the piston drops down slightly (say 1/4"~1/8") and put a mark on the wood; now rotate the engine a bit further Aug 20, 2013 · hello everyone, a friend of mine has just restored a 1971 bsa A65 thunderbolt and it has started to leak oil from the frame on the l/h side were the swinging arm fixture is welded into the spine. My top fork nut is screwed into a rod that goes onto the center of the fork and there seams to be a rubber stopper or something in the way of Nov 7, 2015 · 1970 BSA Thunderbolt 1971 Norton Commando 1972 Norton Commando A65 LC, Tiger 21 350 & a D14/4 Bantam, 175 Bridgestone Twin with Zimmerman discs! Oct 18, 2008 · BSA corrected what I believe is the major deficiency during the 69 model year. The only thing I would change on a 71 is update the OPRV to an SRM OPRV. Jan 19, 2013 · First, the cylinder head. Definitely workable: Pulling the cylinder head off, the cause of the seized engine was apparent as the pistons were stuck fast in their bores. I always use some sort of indicator if trying to true up a 6 spring clutch. Apr 1, 2014 · If you mean the capacitor - Lucas 2MC or similar, off the Brown/Blue cable attached to battery negative as standard - any electronic ignition shouldn't need it; if the engine won't start without it, you have another problem somewhere else. Some say that condensation alone can result in that much water in the oil. Unfortunately, this is marked on the BACK of the stator plate, so you will have to dismount the stator plate to read the back. The design minimises any alterations to the original castings and if you are experienced in changing A65/A50 gearboxes, this should present no problems BSA A65 5S RACE GEARBOX FULL ROLLER BEARING/UNDERCUT DOGS. Aug 25, 2008 · The ratchet gear is free on the mainshaft sleeve with a small spring to push it against the fixed (to mainshaft) ratchet gear. 1969 BSA A65 Lightning 1994 moto guzzi California This is a very common problem and the fix is to clean out the idle circuit using a very fine wire, Jan 19, 2013 · I like the A65 engine, a total redesign of the A10, sorting most of the problems, apart from the timing side bushif that is really a problem . In 1965, the Rocket sprouted 2 carburetors & became the ’65 BSA A65 Lightning. the A65 engine is infamous for its timing-side crank bushing, through which the entire bottom end is fed its oil. 5 quarts in the tank, and there's normally about 1/4 pint or so in the sump after a run. Jan 5, 2025 · I recently bought a 1965 BSA Thunderbolt. Joined: Jun 19, 2012 Apr 11, 2017 · Rich B was also a prolific contributor of posts on optimizing A65 gearboxes. Jul 14, 2021 · BSA A65: THE MOVE TO UNIT CONSTRUCTION The BSA A65-A50 twins, the A65 being a 650 twin & it’s smaller sister-bike the BSA A10 500 twin, were the natural result of the trend, then sweeping the British motorcycle industry, to unitize engine construction. It’s fairly common on the classic bike circuit with the arthritic riders that own old bsa’s and Triumphs, but as a classic triumph and former bsa owner with a fucked spine, I’ve never had much trouble starting even big single cylinder thumpers, so tbh I don’t see much need if you’ve got working knees. May 16, 2014 · 1957 BSA A10 Spitfire Scrambler (numbers matching, very correct, very nice condition) 1965 BSA A65 Lightning Rocket "Clubman" (restored) 1966 BSA A65 Spitfire MK-II (restored) 1967 BSA A65 West Coast Hornet (under restoration) 1975 Norton Commando Roadster (2100 miles) 2001 Kawasaki W650 Feb 19, 2014 · This is a 1968 BSA A65 Lightning. 1971 BSA A65 650 - Project 1972 Norton Commando 750 Dec 11, 2021 · I had a quick look through various BSA A65 manuals from 1962 to 1970 and there seems to be a great deal of variation in chain lengths. Apr 20, 2012 · Original A50 and A65 article (pdf) They’re ringing in the New Year at the BSA factory with a pair of brand-new big twins. Everything seemed fine until I actually rode the bike and then I found that I could only change between 1st, neutral and 2nd. In one way it was good - it took very little force to hold the clutch in but releasing was not always consistant. When I do that, the engine dies immediately. vanislejay, Aug 15, 2022 #1. Low-built and light (some 40 lb lighter than the current counterparts), the latest in the Small Heath line-up are packed with power and as compact in appear­ance as only unit-construction of engine and gear box can achieve. That is why so many of them ended with seized left rods and blown engines. It immediately tightened up after torqueing the bolts to 8ft pounds. I don't know that the weight makes that much difference. May 25, 2011 · If you have a problem with both carbs then it sounds like there's something wrong with the set-up. Jun 21, 2024 · In 1962, BSA released the 500cc A50 and 650cc A65 in response to the increased demand for unit construction twins. Jun 23, 2021 · Hi all, I am posting this thread about some problems I had while rebuilding the primary drive and clutch on my 1966 A65 Lightning. Not a good practice. Sep 6, 2011 · I have only done just over 300 miles on my A65 since buying it on ebay. lbs. Aug 28, 2012 · 1967 BSA A65 Lightning powered by a 71 A65 Firebird AKA phsyco4u Technology is not the cure for stupidity! After cracking the primary case open the problem was Apr 13, 2014 · I have a 67 BSA A65 that I just drained the fork oil and when I went to fill my tubes up I started putting oil in one of them and when I put about 75cc of oil in it, it started pouring out the top. Don't want to have problems and blame the Boyer when you may have other problems that you were Oct 26, 2012 · I have made it to the rebuilding of the gearbox for my 1966 Spitfire project. Aug 16, 2019 · Hi, BSA gears have "bronze" bushings inside the gears similar to Triumphs. It's now being rebuilt for other reasons. SRM which is CNC machined from billet alloy and Hepolite (England) which is CNC machined from cast iron. Changing up 1-2-3-4 is no problem. You'll end up with a broken side stand lug. Mind you, the Mike's XS valve needed occasional cleaning to get rid of oil also. Apr 8, 2012 · Britbike forum Forums British Motorcycle specific Brands Bsa bulletin board 1963 A65 Fork Problems: 1966 BSA A65 "Beezuki" with GT550 two-stroke engine Sep 7, 2016 · 1969 BSA A65 Lightning 1994 moto guzzi California This problem is easily fixed by loosening the engine mount and moving the filter housing upwards when inspecting . Engine turns over freely like it should before oil pump installation. and substituted a roller of identical dimentsions for the ball and used the lip of the roller as the left side thrust surface. However, I'd like to convert it to a proper daily driver. Aug 8, 2009 · The hole in the connecting rod is, after all, the end of the hose for the BSA A65 oil circuit. B. The corrosion problem is real if you use the wrong oil. Nov 6, 2010 · I thought that I had this problem fixed but it is back again. . I forgot to ad Nov 7, 2010 · A lot of the problems with Boyers is that they are purchased because they are the cheapest units available and installed in the same manner, cheaply. There seems to have been a fair amount of BSA related stuff recently and I was wondering why. BSA has, IMO, a problem with the switch cavity. My (non standard)1964 A65 Rocket has a 3 wire Alternator,so I assume this is the original 6 volt Lucas RM19. 3 days ago · Mark / BSA WM20 / 1968BSA, Great! Thanks for considering the problem! I respect your thoughts. Everyone seems to swear by the boyar electrical upgrades. Oil will slowly drip past the gears into the sump. I've read everything I could find on this forum and others to figure out how to correctly set the timing. Jul 14, 2021 · The 1962 BSA A65 Star was joined in 1963 by a tuned version (higher performance), the A65 Rocket. S. BSA does not state this, but the 70-2968 spacers now comes in different thicknesses, bore sizes for different (universal) applications and material (phenolic) Jun 19, 2012 · It has two problems that are maybe related: 1. Unfortunately I don't possess a meter,I'm hoping (albeit naively) that the wires would have a known particular colour for in/out etc. Today, the BSA A65 remains a popular model for both restoration and customization, and fortunately there are plenty of them still around. Both are wonderful upgrades from any original BSA oil pump. Apr 7, 2007 · Britbike forum Forums British Motorcycle specific Brands Bsa bulletin board A65 Hornet - Energy Transfer Problems Forums Calendar Active Threads New Sponsor post Sep 16, 2007 · On my '70 A65 the clicking was one of the balls falling back into the stationary pocket. Here’s part 3 of my 69 BSA A65 transmission rebuild this video shows the installation and also covers the clutch installation and adjustment . So the engine would have to rotate at 930 * 60 or 55,801 RPM to reach resonant frequency and half that to be 180 degrees out of phase. May 7, 2022 · An instant drive off the throttle regardless of revs; an exhaust bark like nothing else; timeless good looks; decent build quality; and much more are all on offer with an A65. i have dropped the needle & it has lightened the plugs colour slightly plus improved mid range response ,however at idle the bike is rich ,mixture screw only changes the idle a small Jul 22, 2021 · Previously I've used the technique described by Ed V on the E&V tech tips link Here, see BSA A50/A65 Oil Pump Installation Tips. That first A65 was a pretty benign bike, having a modest compression ratio of 7. Very tight. Jan 4, 2025 · Most of the BSA race bikes I've seen have big breather tubes from the top of the primary case. May 1, 2008 · Keywords: BSA A65 Oil Change makes wetsumping problems and oil changes much easier. On any given day I can go out prime the carbs and kick it once and maybe go for a nice ride. [ 3 ] Hi I recently had to remove the inner timing cover on my 1963 A65 Star. The E&V technique basically involves fitting a temporary oil supply if the engine is out or using the normal oil tank if the engine is fitted. I have replaced all the bearings and seals. I am not sure if it´s new , or it has been there for some time, valves were always making some noise, but I guess that´s natural. Find a center stand, they aren't that hard to find for a dry frame A65. I felt the A65 gearbox when setup is at least or more than a match for those AND I can select neutral at a stand-still in the A65. I verify from the makers the oil is safe for brass/bronze type metals. I have double and triple checked connections and voltage. BSA boosted the HP in the A65 from about 35 HP to 52 HP in the early sixties. I rode the second one for ten years with no lower end problems. I just can't get it beyond that point. Holding onto the success of its 1950s machines, BSA perhaps felt that totally reimagining the bike might alienate its loyal audience. com | Fax (902) 542-7479 | Canadian Tel: (902) 542-7478 Helping keep British Motorcycles on the road for over 30 years - established 1977 Sep 28, 2012 · Hello, I experienced that the clutch on my '68 A65 Spitfire is somehow btough and rough to pull. Once Boyer fixed the problem with the anchorage of the pick up coil leads, the only major problems seem to have been the rubbish blue insulated crimp terminals that they insist upon using. 5 Feb 15, 2012 · Only problem John is you do not have to many new BSA rods to buy - quite different situation comparing with Triumph. We used them on 750 BSA twin flat trackers , and on my road race bike since the factory breather was not adequate on a stroker. The bike is a 66 A65 Spitfire, it has a Boyer, a tympanium, and a sparks alternator. My problem is, as I learn more about these bikes, the more I care and the more I notice all kinds of sounds or phenomenons and I am not sure if they are good or bad. The idle is fine most of the time, but will occasionally start to waver and drop down, occasionally stall, sometimes it's hard to keep the bike idling. The fix, hone the tubes. ) Try to position the magnet rotor such that the stator plate mounting screws are in the center of the slotted holes. Oct 17, 2011 · In fact i have just done the same to mine flatted off the end plate and the pump body due to the gouge marks. What code have they got stamped on the side? What shape are the spray tubes - the brass tubes sticking up in the bore of the carbs? Are they cut off square or do they slope? Dec 8, 2021 · To combat this problem, BSA recommends that you must use the 70-2968 insulator block to help prevent heat transfer to your carburetor. Aug 7, 2017 · - the oil pump is operating efficiently with no leaks, preferably using a later DD type or iron bodied, see BSA A50/A65 installation tips At this Link Converting to an end fed crank is certainy a good idea, however I believe the original setup will work OK if detailed attention to the above is made and this has been the approach I have taken Aug 31, 2015 · By 1969 BSA had tackled most of the A65’s obvious flaws (and the ones which remained required rather more fundamental efforts to improve them). As he was getting some help from BSA it is not suprising that he eventually did use the unit motors in 500 and 650 form. This affect can be even greater if the engine was last shut down with the pistons up in the cylinder, meaning the rod journal is up and the sludge trap cavity can drain empty as well as the empty the crank drilling. Apr 12, 2005 · This caused problems for the damper tube/seal due to excess friction during movement. 5:1 with an output rated at some 38 horses at 5,800 rpm. Aug 9, 2017 · The U. Started well warm and cold (with choke) Decided to get a set of new AMAL's (same everything -main, needle, cutaway etc. The oil tank has a 3/8" outlet, and a 5/16" inlet with the return pipe to feed the rocker arms. The book calls for 60 ft. Nov 29, 2011 · Help! Need some help timing a 66' BSA A65 with a Boyer ignition. I've had two A65 lowers rebuilt without line-boring the bush. Some who are more anal than I go as far as to use a dial indicator, they never seem to have clutch problems on the road, then again they take a whole day just to adjust a clutch. The factory was Aug 3, 2006 · Tricky ignition problem BSA A65 Spitfire Mk4 Spitfire: 08/03/06 9:27 am: Re: Tricky ignition problem BSA A65 Spitfire Mk4 nert: 08/03/06 3:44 pm: Re: Tricky ignition problem BSA A65 Spitfire Mk4 RF Whatley: 08/03/06 4:39 pm: Re: Tricky ignition problem BSA A65 Spitfire Mk4 Rich B: 08/03/06 4:45 pm: Re: Tricky ignition problem BSA A65 Spitfire Apr 3, 2021 · BSA A65 GUIDE Compared to its pre-unit counterpar­t, BSA’S A65 accumulate­d something of a suspect reputation over time. I think that is why BSA used the Brazed tube into fitting process originally. The new-for-1962 unit-construction engine had started out rocky, with lots of serious teething problems. Probably one of the best features for the 1970 was the "dry" frame. One can assume that they were modified to breathe as a later Triumph. Nov 7, 2007 · On an A65, with a good, tight oil pump, the bike can sit for a month or two. They were getting a lot of bad publicity and poor sales with the early failures on the A65. Take a close look at them and see what the road tests are all about: quarter mile times! The manufacturers pay very close attention to what the U. It developed this strange clutch issue after 9,000+ trouble free miles. The Legacy of BSA. Just the next year in 1971 (also carried on in 1972) BSA designed and produced a new frame in which the oil was located in the center frame down-tube. The earlier models used a clutch actuating lever inside the left engine cover that was connected behind the cover just above the kick start lever, with the cable entering horizontally from the right. Jun 7, 2014 · 68’ A65 Lightning “clubman” 71’ A65 Thunderbolt 67’ D10 sportsman (undergoing restoration) 68’ D14 trials (undergoing transformation) 70' A50 Royal Star 67’ A65 Spitfire (awaiting restoration) 72’ A65 Thunderbolt - (Awaiting rebuild into replica A70) 59’ A10 Golden Flash And a few unit twin engines. I have several complete BSA A65s plus engines. Some have also suggested using the timing aperture behind the cylinders for extra breathing. Had the top end rebuilt as well as some other sorting by local Brit guru about a month ago. A brittle weld, or to much tube damage is the problem. Description of issue: Clutch does not engage smoothly. The bike is in good running condition, strong idle, clean carbs, etc. Straight old 90w is very hard to come by these days. Home 1968-1970 A50/A65 Coil Mount Ref Photos. Apr 23, 2008 · Legend had it that he was literally forced to use the A65 motor by BSA . Sep 24, 2012 · I've recently bought an A65, generally in very sound condition but there is a problem with downward gear changes. • Hasting's BSA A65 rings, part number 6939, are not taper faced. Aug 27, 2008 · I am hardly an A65 "guru" but I have sure worked on a bunch of them. 5118; BO Part Number: 20-10166C; Download Parts Catalog - PDF Format Jan 14, 2013 · UPDATE ON BSA A65 WET SUMPING WHILE RUNNING. market wanted more performance for the A65, so BSA just loaded higher compression, hotter cams and dual carburetors on top of that same old under-designed crank, rod, and lubrication system. All of the other hot sidecar road racers followed the lead Dec 26, 2004 · A roller and ball combination is a better design if the loads are adequate cause it contols axial movement. A65 cylinders are bored +40,new pistons and rings,ring gaps are good and spaced/rotated proper,head has valves relapped in,valve guides seem to be in spec,compression check 130 psi each cylinder give or take a few psi. I have to add initially I was a five to ten times kicker, but after a lesson in high speed kicking techniques where one learns to kick at lightening speeds (maybe that's how the ike got its name), now each times a winner. Working on the kickstart ratchet mechanism I have encountered a problem. Nov 1, 2024 · 68’ A65 Lightning “clubman” 71’ A65 Thunderbolt 67’ D10 sportsman (undergoing restoration) 68’ D14 trials (undergoing transformation) 70' A50 Royal Star 67’ A65 Spitfire (awaiting restoration) 72’ A65 Thunderbolt - (Awaiting rebuild into replica A70) 59’ A10 Golden Flash And a few unit twin engines. May 31, 2020 · 68’ A65 Lightning “clubman” 71’ A65 Thunderbolt 67’ D10 sportsman (undergoing restoration) 68’ D14 trials (undergoing transformation) 70' A50 Royal Star 67’ A65 Spitfire (awaiting restoration) 72’ A65 Thunderbolt - (Awaiting rebuild into replica A70) 59’ A10 Golden Flash And a few unit twin engines. As I understand it, the motor and tranny are solid, but the electrical system (and to a lesser extent the brakes) are the real problems. Nov 9, 2012 · my 65 a65 single carb is running a mk1 Concentric carb ,carb is a later type & not worn out,the bike has not done many miles since being rebuilt,bike seems to be getting richer at idle the more miles i put on it. It didn't take much to coax the cylinders off the case. Jan 16, 2015 · 68’ A65 Lightning “clubman” 71’ A65 Thunderbolt 67’ D10 sportsman (undergoing restoration) 68’ D14 trials (undergoing transformation) 70' A50 Royal Star 67’ A65 Spitfire (awaiting restoration) 72’ A65 Thunderbolt - (Awaiting rebuild into replica A70) 59’ A10 Golden Flash And a few unit twin engines. Richard's. Some research indicated shift return spring and I found that if I manuall Feb 16, 2021 · Has anyone successfully fitted an Electrex world stk-012 race ignition to an A65? iv'e just spent 2 days trying to figure out if its the new wassell premier carbs or the ignition, it will start on rollers but not on the kickstart, so today i fitted a wassell vape unit and it went second ki Aug 14, 2017 · I noticed a sound coming from my BSA A65 L/R . Paul Henshaw has built and ridden most of the range, and reckons their infamy is undeserved… 2021-04-03 - Photos by Paul Henshaw Dec 28, 2012 · hi all,need some help hereive finished a 1968 A50 BSA converted to a A65 (650 top end) a50 and a65 bottom ends have same stroke. Mar 17, 2023 · Here are my thoughts, since we do sell both pumps The SRM pump and Hepolite pumps are both made in England The SRM pump does come with more components, while the Hepolite pump does not, however the retail price reflects that on both brands of pumps Aug 4, 2009 · The real problem is the fuel which is not suitable for our bikes. Jan 3, 2013 · UPDATE ON BSA A65 WET SUMPING WHILE RUNNING. just answering the thoughts if I can, so we are all on the same page: - Top Center was found and duplicated over and over by me, and by another set of hands,. Brian had a similar problem with his DB32 , B31 & A10 so he has gone to regeime of emptying the tank after each run ( pops it in the truck) then always filling the bike with very fresh fuel the night before he is going to use it and has not had a problem with plugs fouling since. Exactly why BSA’s nomenclature department chose to label their super-sports twin with the name from a relatively ancient fighter aircraft, when the other big twins came from the relatively recent jet age – Lightning and Thunderbolt – is a little mystery, but somehow Spitfire seemed very appropriate for the cobby red rocket. It took the likes of SRM to provide a proper solution to the problem with their end-fed crankshaft conversion and replacement of the timing side bush with a combined needle and ball bearing which positively located the axial Aug 31, 2015 · Spitfires were – and remain – pretty rare birds. Jul 14, 2021 · 1965 BSA A65 1965 BSA A65 LIGHTNING The Lightning was the high-performance roadster in the 1965 BSA A65 lineup, with twin Amal Monobloc carburetors and downswept pipes. Problems: The crank flywheel had no timing pin holes/slots in the OD to affix the timing pin once assembled. I think the problem is the pressed pockets are not uniform or wear unevenly. 7 volts to the unit, battery is good. When the bike is running, everything is fine until I turn the headlight on. The BSA development team decided to keep costs down by re-using the well proven single sided front brake from the BSA Gold Star and the same full race camshaft as the BSA Lightning. on assembly the pump was solid even though i had flatted off the body with the gears in place, But aluminium is softer than the harden steel gears so the gear became proud about a thousand of an inch i flatted the gear using plate glass with 1200 wet and dry and the gears turned freely. I have a Vape ignition and have had intermittent spark problems. Mar 19, 2005 · If your missing the center stand, DON"T use the side stand to support the bike while kick starting. Nov 27, 2012 · Hi there I have an A65 1963 and have had this noise since restoring the bike it sounds like a metallic knock it is there when the engine is pulling slightly at 25-30 mph it goes away if you slightly close the throttle but comes back as soon as the engine is pulling again. Make sure the timing is spot on. It does have tighter piston to body fit and so far, IME, works great. The BSA A65 Star was a Birmingham Small Arms Company (BSA) motorcycle aimed at the US market for unit construction twins. Dec 9, 2024 · 68 BSA A65 Vape ignition intermittent spark problem. i believe this is a common problem with these models and is brought on by using the mainstand which is a pig to use and requires alot of effort to put Sadly, Dick Mann’s win on a BSA A75 triple at the Daytona 200 in 1971 came at a time when BSA was nearing the end of the line. 04/12/24 6:11 May 1, 2013 · The clymer bsa a65 manual details this mod ,small level holes drilled between primary and crankcase, no seal and a large bore breather out the top of primary,works ok but i dont like the idea off crap from the primary going around the engine,there are loads of other mods but why ? standard works well if the engines ok Dec 15, 2023 · 68’ A65 Lightning “clubman” 71’ A65 Thunderbolt 67’ D10 sportsman (undergoing restoration) 68’ D14 trials (undergoing transformation) 70' A50 Royal Star 67’ A65 Spitfire (awaiting restoration) 72’ A65 Thunderbolt - (Awaiting rebuild into replica A70) 59’ A10 Golden Flash And a few unit twin engines. Ridden with its capabilities and not ragged like a Japanese multi, a BSA A65 will always put a smile on your face – they also handle rather well into the bargain. Oct 2, 2014 · 1966 BSA A65S Spitfire Mark II Special. com, where this topic has been discussed. A65 ENGINE ADVICE 2017-09-30 - Barry Huron . 1963 BSA A65 ENGINE WORK As would be expected from any second-year model, following such a major engine redesign, there were teething problems. If they feel that quick quarter mile times will sell bikes, what do they do? i've been experiencing frustration in regards to potential low oil pressure problems with my '71 BSA thunderbolt. My gearbox has been rebuilt using about 80% brand new compo Apr 7, 2016 · 1969 BSA A65 Lightning 1994 moto guzzi California copy and paste it into google , its an old britbike forum topic , very relevant to your problem. BSA never solved these problems with the A50 and A65 which retained the timing side bush throughout their lifetime. Moreover, capacitors - particularly old ones like original Lucas - bring their own problems you don't need. Fitted with 12 volt electrics, a Zener diode voltage regulator and twin coil ignition, the Thunderbolt sold well in the important US import market and with the 3. I am hoping that the information may be of help to anyone who encounters the same problem I had. 26" long so the fundamental frequency is approximately c / (2 * l), neglecting the spherical end correction, or about 930 Hz. The first one I rode for twelve years with no lower-end problems. vanislejay Been here awhile. Unlike Triumph who just put pre unit internals into a single case with a few improvements like a duplex primary chain and revised head stud pattern. May 25, 2011 · This all started with my A65 running decently but having to fiddle with the old clapped out carbs to get the bike to idle well. I can not hear it Jan 5, 2025 · +1 on keeping the BSA stuff on a BSA forum. 1965 BSA 500 Twin & 650 Twin. Carillos for $ 850 + tax & shipping are out of my budget, and MAP rods are difficult to get. The bike starts up fine in the morning, but after about 2 minutes on the road the engine will stop running almost like the ignition has been switched off. magazines of the sixties. mags print because it was by far their largest market. A50 - CYCLONE ROAD MODEL; A50 - CYCLONE COMPETITION MODEL; A65 - THUNDERBOLT ROCKET; A65 - LIGHTNING ROCKET; A65 - SPITFIRE HORNET; CATALOG NO. Jan 30, 2010 · I have one question concerning A65 shuttle valve front end. Pump on straight, engine on bench, fresh rebuild. Oct 18, 2012 · David, If this is a high mileage engine the right hand journal tends to wear on a taper so check this with a mike inside north to south and east to west and outside the same way the fact that your shim pack was installed incorrectly makes me think you will need to change the bushing and possibly have the crank ground undersize. Sep 19, 2013 · Re: 1971 BSA Oil in frame A65 Lightening « Reply #2 on: September 19, 2013, 09:49:51 AM » Powder coating (in my experience) isn't that good; you can't use filler, nothing fits together afterwards and any trace of oil or grease leaves pin holes in the finish. Jun 29, 2006 · The BSA idler pinion turns counter-clockwise, so you want that hole. Nov 10, 2007 · Hi norbsa,thanks for replying,there are no terminals on the switch just the coloured wires. A new frame had been designed by BSA’s hopelessly misguided Umberslade Hall tech center. Jun 19, 2012 · 1972 BSA A65 Idle Problems. You just have to pay attention to what the drag, slip, rumble and judder is telling you. This is clearly shown on the pack the ring Jul 16, 2016 · Apologies in advanced for being such a tender foot. The bike holds about 3. The engine runs just fine, but changing gear is pretty poor with false neutrals and a reluctance to change every now and then. Feb 28, 2024 · 68’ A65 Lightning “clubman” 71’ A65 Thunderbolt 67’ D10 sportsman (undergoing restoration) 68’ D14 trials (undergoing transformation) 70' A50 Royal Star 67’ A65 Spitfire (awaiting restoration) 72’ A65 Thunderbolt - (Awaiting rebuild into replica A70) 59’ A10 Golden Flash And a few unit twin engines. From what I can gather, if the pump and NRV are in good condition, then with correct fitting this problem should be resolved. I've got a two tube oil feed for the bottom of the engine with 2 5/16 send and return lines. on the nut that secures the mainshaft to the bearing in the remo Finally us BSA A50 & A65 owners have a choice of 2 new high delivery oil pumps to choose from. And forget the oil pressure switch readings at low RPM. This makes it quite difficult to ride. In 1965, it was still running 6 volt electrics, its last year before converting over to 12 volts in ’66. I've been running these with a Boyer and stock coild and always fire up first / second kick. It's very jerky, grabby, and inconsistent. An A65 with 9-1 compression isn't that hard to start. I've also watched Wes Whites video a dozen times. Nov 19, 2006 · I have a 1970 BSA A65 Thunderbolt, it is fitted with a Boyer Ignition (I put the Boyer in about 10 years ago). Installed it with the hardware provided. Run the Boyer with a separate fuse directly from the battery through an ignition relay and they will give you no problems. The 1962 to 1965 parts manual lists the Lightening rocket as using 21/50 sprockets and 109 length chain. If we wanted to scratch our heads about substandard engineering and ugly aesthetics, we would have bought one and also have been over on the other forum😉🤣. Prior, most engine packages were made up of separate crankcase, primary case & gearbox, all bolted together in mounting plates inside the Jul 14, 2021 · 1962 bsa a65 – teething problems In an effort to save a few cents (farthings), clever BSA used a copper-lead bushing instead of a main bearing on the timing side. Discussion in 'Old's Cool' started by vanislejay, Aug 15, 2022. Not sold here. In the lower end Carefully check rod big ends for OOr Dec 20, 2013 · Fred was a BSA/Triumph fan before marriage and fatherhood intervened, and he then developed an interest in old cars until back problems made crawling under chassis an unattractive hobby. The metallic gold colour scheme was unique to the Lightning Clubman Sep 22, 2010 · An additional breather surely will not hurt matters. It has been running fine for years and now it has developed a problem. My top fork nut is screwed into a rod that goes onto the center of the fork and there seams to be a rubber stopper or something in the way of Nov 2, 2007 · Hi Chaps, Champion N3C's on the Lightening and N4C's on the T-Bolt. The engine is in good condition new Wassell carbs, valves and timing are correct. After using new bushes everything feels dandy on the begining and and of the slider stroke, unfortunatly in the middle they are pretty loose. Finally us BSA A50 & A65 owners have a choice of 2 new high delivery oil pumps to choose from. uniob ecvcei fdp mrcjjwm zmj tqg ouhcu sljekjq fcgbwv oqwxb