Bultaco

Hi all, Could anyone tell me should there be some sort of seal/rubber betwwen the rear exhaust section and the middle silencer on a 78 Sherpa. If not what stops gasses leaking from that joint. My bike leaks from there but because I am out of country I havent had a chance to strip it yet. It would be handy to know so I can order parts ready for when i get home. Cheers Marty

On my recently acquired Sherpa the engine no. Is M-9201757 has anyone got an idea of it’s year please help Terry

Any of have experience with an air leak like this on a 4spd Bultaco ,base of the cylinder, I’ve already replaced the gasket with fresh yamabond to little improvement.5psi drops to 1psi in 5 minutes.Thanks!🙂

Long story cut short... I bought a lovely shiny Bultaco about 10yrs ago. Been in the shed most of its life but now thinking of getting it registered for the road, it's an age thing!! I have the original green log book and an MOT from 2001 to 2002 the green log book states that the engine number M4904576 and I can read it on the engine. The frame has been powder coated so I can't read the frame number, but all the documents (old green log book) say that it's chassis frame or car No is SM145 and it says the same on the MOT I have. Do I have to sand the frame back to check that this is genuine before I can apply for V5 or is SM145 on the docs a true frame number as I can't f…

Good Day Gentlemen, After reading the post in regards to the pre-65 Model 10, I thought I'd share this with you all. I found this early Bultaco local to me this morning. It looks like a Sherpa N. It has all original hardware and fittings except for the throttle, fenders and silencer. The front fender is actually a piece of all that is left of the original (I can tell by the fibreglass type) but reversed and a rubber flap added. What I find really interesting is that the frame serial number stamped under the seat behind the tank and is a very early Sherpa S frame - B-300087. That is a low number frame, has to be 1961ish. It seems to have all Sherpa N components exc…

could anyboy tell me were the over flow tube gose on the chutch case? ive got it tuck inbeween the finns at the moment but wont it melt with the heat or is there a fitting that clips on the finns so the tube can go throw?

Hi All, I am in need of two dampening valve for inside my sherpa t forks. It would appear it has taken at bit of a nose dive before it came into my possesion, I have located the two topping out springs which were broken also but cant locate the other bits. I have tried the usual places but cant seem to find them, Really need these now as these are the last piece of the puzzle to get me away riding!! Anyone have any suggestions please. Dan

Hi, I hope some of you more knowledgeable Bultaco owners can help. i have a model 90 that has been fully rebuilt and it’s fitted with 36mm Mikuni carburetor and new electronic ignition. Its an absolute pig to start, but when started the motor sounds strong and will happily rev to 6000 and will tick over, but when riding on the road the engine runs very erratically and will not push through 5000 revs. The engine after 1-2 miles will start to misfire and run really badly. I have changed the main jet, pilot jet and needle with no joy. I now wondering if I have a dodgy ignition system ? Any advice? thanks Mark

The M27 started second kick after 38 years dormant. Rex Caunt Racing ignition highly recommended. Helpful guy. Bit of fettling to do yet but finally getting somewhere! Cheers https://photos.google.com/share/AF1QipNeADlix5rmUCVeRieJqA8ywiXHqTh98Ckni2w5YK9EnDxHDDhoBcOeiI9L_KbpEg/photo/AF1QipOZJJ-jyDSKYxUvX3fTZwcd74BCdQ8dzLrRNwR5?key=UDQycVR1TWdqS190ZUNhWmZiT2p4Vmd0eElQcFdn

Finally found a bike related activity that my daughter enjoys - cleaning my Bult! Fantastic http://www.flickr.com/photos/76022002@N08/12883757635/in/photostream/

hi patrick this is the fuel tank ive just got

I am hoping someone can help with finding or selling me a copy of a book.History de la Sherpa T the story i wanted it for a birthday present, the publishing company in Spain are out of stock and i missed the one for sale on ebay by a £1 in the last 5 seconds :( . it was destined for a birthday present. if someone has a copy and would want to sell it i am happy to pay a fair price for it, desperate is not the word!! i would really appreciate it and thanks in advance to anyone may be able to help. i was also after the Motorcycle trials techniques and training by Lane Leavitt and Len Weed twinshock , although this was not quite as important. all the best Hencam

I am in the process of restoring my 77 350 Sherpa I am at the rolling chassis stage and now checking the motor over, before I started the project I rode the bike and all vital signs were good ie: gearbox selecting as normal clutch responding as normal engine crisp and responsive, I have taken ths cylinder head off and decoked the head and piston crown. I noticed there is no head gasket is this normal on my model ? also stamped on the cylinder close to the overlap joint is 159 R my engine No, is JM-19100771 the bore is unmarked with a std. Mahle piston any help gratefully received Stanley

Hi all, just rebuilding my Frontera 152 engine, I'm using the Inmotion Italkit piston and crank set, new rod too. There are two piston rings - a chrome one and a black one. Which one is the upper and which is the lower? I've emailed Inmotion but sounds like he's super busy... and can't reply before Tuesday anyway... just trying to get a headstart. Ta.

Hi guys I have spent 2011, buying bits and pieces to finally build up a modified/competative bultaco and have been trying to find out what modifications work and dont work. My questions are what are the best hubs to use for braking performance? I have got steel linners in my 159 and they produce ok stopping power but nothing compared to some TYs, honda,fantics and certian pre 65 scotish winning bikes i know. Has any one tried a different exhaust on there bikes? the bultaco ones seem heavy take up a lot of room and get a lot of mus stuck between it and the rear tyre......i was think a yammaha ty pipe work may work better. last of all..... the clutch. my clutch work…

I’m currently renovating a 1979 325 Sherpa which has the small air box with the door on the side. I be heard a lot of negativetity over the years about them being to small. Would a later 199b be better? Will it fit? I intend to run a 26mm Mikuni on this bike. What do you guys use? Many thanks.

I am restoring a Model #138 and am searching for an exhaust system for this bike. I am most interested in finding the the header pipe, as I can source the intermediate and the final piece from InMotion or other vendors. If anyone can assist I would be very grateful.

Hi all, a strange request I know but I'm miles away from the bike for a few days. What are the dimensions of the Bultaco logo on the tank of a Sherpa - 92 if it makes any difference - which i don't think it does. The word 'Bultaco' specifically, and more specifically, the height of the letters. Thanks for your help Paul

So I took apart my Metralla 5 speed motor a few months ago. Just ordered parts and am ready to put back together. I pressed the clutch side crank bearings on the shaft and into the case. For the crank seal there is an aluminum piece that the seal fits into and a steel race that goes over the crankshaft and that the seal rides against. Should this race fit into the aluminum seal holder flush or does is there a space?

Hi Chaps I have just brought a 78 model 199 Sherpa and need to equip it with some lights. I'm on the East coast of the US, can anyone point me in the right direction of some suitable copies/reproductions I'm really after everything, lights and loom/switches and resistor if possible... Thanks in advance.