Bultaco

Hi all, Just rebuilding the back end of my 199A, wheel rebuild, new shocks etc. Bushes & bearings are ok & bought a new spindle because the nut was missing & thread was shot. Question about the rear engine mount. I've got the cast ally one which I would like to keep but the machined faces where they meet the steel bearing look completely buggered so I was planning to have them machined true & square and fitting some stainless shim washers. I take it that the width across the engine mount needs to be wide enough to not allow the bushes to bind when it is all sandwiched together but not to much as to allow the swinging arm to have too much lateral…

I've just refitted the clutch onto my 190 and obviously as a first-time I've tried to follow the manual to the letter. I've adjusted the nuts whilst holding in the clutch and working the kick start and I think I've got the plates nice and true. However this means that the holes in the nuts for the lock wire are all over the place. When I dismantled the clutch they were nicely in line so that the lock wire made a nice loop and I've seen a photo of similar elsewhere on the forum. If I adjust the nuts to make the lock wire look tidy will I not be upsetting the alignment of the plates? Also, how on earth do you manage to torque the flywheel nut to 95 ft/lbs?? I got the clutc…

hi all im puting speedo on me 199A i no theres to ways you can mount the speedo can any one tell me witch is the best way? allso the speedo cabel is runing from the rear wheel witch way do i rout the cabel last time i tryed it i whent throw the loop on the swing arm across the bash plate. and up throw the loop on the frame but the cabel keeps poping out from under the magnot cover is there a beter way of routing the cabel so this dosnt happen? one more thing is how tight do i tighten the bottom.and top yoke nuts? i know they should be tightend up with a c spanner but havent got one. and dont no what size to get?

As above, my newly acquired mod 183 ('76 350) has a slightly bent upwards swingarm on the the left side just forward of the brake stay fixing point. I will attempt to have it straightened but would then like to leave it as original because it still has all the original brackets and clips in place for the stop lamp switch and its cable, which I don't need at the moment but would be nice to keep in place. Basically, I'd like another swingarm to install for some actual Twin Shock competition which won't bend, what would people suggest please? My thoughts are...... 1). Source another 159/183/191 swingarm on ebay or wherever and weld gussets along the the top s…

Hi guys, Just bought a 1979/80 198 A 250, it has electronic ignition. I've bought a new spark plug which I've been advised needs a gap of 0.4mm, but when I ordered it I didn't say it had electronic ignition. Is there a different gap setting for each. Also the bike runs and starts well on choke but dies when the choke is turned off. I've had the carb apart and found 150 main jet. 20 pilot jet. 3 slide. 2b1 needle 106 main jet. I've had carb cleaner through each and every orifice, because I thought it would have been a blocked pilot jet. The previous owner has owned it for years but hasn't really used it for a few years. I've drained and flushed the tank and go…

hello all just want to know what would be the best spark plug for my 199B? i have used NGK bp5es on other bultacos what you guys useing? cheers bondy.

South Liverpool Motor Club Trial 1977 We had a great photographer come along to most the events he even managed to get a few shots of me with both feet on the pegs.

Hello again, Refering to my 64mm stroke crankshaft in my 325 sherpa t engine, that should be a 60 mm stroke. Am I disappointed after fitting a new rod kit and assembling the engine cases.You better believe it I am. Should I have checked the stroke? Maybe I should have.But in my defence I bought it as a basket case. Well I have a Italjet 326cc engine spare sitting on a bench in the shed.Does anyone know if the crank out of it will fit my Bully.I know they share common piston's and rod kits.They have the same flywheel.They share the same bore and stroke.I guess I could strip the engine ,but the work benches are full at the moment. So if you can help it would be apprec…

Hello All, I rode my 350 sherpa last weekend and if started to p*** fuel out of the overflow on the carb. It didn't matter if it was running or not. I took the float bowl off and everything seem ok. It's never done this before and I would like to keep my Bing.

Can anybody tell me how the early 70's 250 and 175 bikes compare (to each other)? Am I right in thinking the 175 was the same bike as the 250 but just with a reduced bore size? I used to have a 74 250 which I really liked, and now I'm on the look out for another early 70's-ish Sherpa, should I just be looking for a 250 or is the 175 a good proposition? Thanks all.

I am having a difficult time getting the rear wheel axel etc. back together. I took pictures before disassemly and it is set up the same way now. But when I tighten the axel nut the wheel will not turn. I know it needs new bearings and seals but .. I was hoping to get it back together to give it a once around the yard and work out some of the other set up issues (brakes,clutch etc.) Does this set up look right? Thanks

Hi all, First posting so be gentle. been a long time since I went on a trials bike, had all sorts in between. First ever bike was a Montesa 50 - went from Kent to Devon on that, then an Ossa Mar - went everyday to college on that, then a King Scorpion (not a trials bike I know) then a mixture; 650 Kawasaki, RD500, 750Turbo, BMW around the world and ZRX everyday (nearly). Always wanted to get back onto a trials bike and always admired the Sherpa. Here's what I've just (unwittingly?) bought, this is what I think I have, what do you think I have? Bought as a 1973 92 model Engine number: m-9201750 Frame number: b-9201729 But - all the below look different from online re…

Does anyone have a diagram of a 340 6 speed gearbox please. Split it several weeks ago, put it back together today and it seemed to find all the gears when manually using the shifting drum. Put the other casing on ( without the crank ) inserted the gear selector shaft and shifting trigger mechanism and it wouldn't engage a gear. Done a couple of 5 speed boxes before no problem. Serves me right for not doing it all at once. A diagram would greatly assist although I bet they're like hens teeth. Its either a selector in the wrong sequence although I don't think so or the shifting trigger mech, but again they look ok. Something to ponder over gen…

Hi All. I have a 1972 Bultaco which has a fully rebuild engine with electronic ignition. But I can't get it to start as it should. If I use Easystart (or brake cleaner) it will fire up and run well. I can turn it off and it will restart 2-3hrs later first kick. But if I leave it overnight, it won't start. I'm using a new BP5ES plug with a 0.7mm gap as per the ignition instructions. What should I try now?

hi all a wile back i posted a thread asking addvice on a oil leak due to work.and other thing ive not had chance but today i had some time so off to the shed i whent id allready put a new clutch basket seal in witch only seemed to be in halfe way so i replaced it with a new one.and put it in proper for got to menton the ATF oil was geting in the gear box i only noticed this when i drained the gear oil off. and it was a redish colour so i investergated ive allso replaced the front sproket seals.and distant spacer.and final end seal ive unblocket the clutch vent with a pice of wire.and still to my disapointment its still got a slight leak from what looks like the final end …

I've got wheel alignment problems with my Model 159, even after straightening the bent swing arm and triple clamp. I've measured and drawn up the swing arm and cast aluminum rear engine mount and it sure looks like the engine case center is supposed to be on the centerline of the bike with the swing arm centered on it too. Yet with good sprocket alignment (fresh sprockets too) to get the rear wheel aligned on the front wheel the rim has to be pulled over towards the sprocket to the point where I've got serious concerns about the amount of thread engagement between the spokes and nipples on the right side of the wheel. Perhaps the new Buchanan spoke set is off, with the…

hi i can anybody help i have a noise comming from the primary clutch case. so ive had alook.and the primary drive chain is slack there is a tensioner on witch is ok looks like the chain has been catching the weight hence the noise. anybody know how i change the chain? is this a hard job to do?

Posted a pic of this bike with JR nearly aboard in the Arena Trial thread but thought you Bultaco Fans may find the bike interesting, this is a better side view.

I'm interested in using friction material plates but NOT the more expensive Barnett ones for bultaco. read on here about using certain Japanese bike plates and it looks like the kit that is sold by Bultaco UK(?) uses that type plate evidenced by much bigger inside dia. Anyway, all these plates are listed as 110 O.D. but I'm measuring the Bultaco hub I.D. right at 110. are the plates slightly under or do they have to be filed down to fit? I know the tabs are wider but I'm talking about the diameter of the plate fitting the dia of the hub. unfortunately I just buttoned up the clutch side on my son's 87 Honda cr80 after inspecting the clutch. at the time I wasn't …

A dumb question maybe - should a 198b have a Cyl Head Gasket - just rebuilding mine for the first time and it dosn't have one?? Paul Mac