Bultaco

Hi All, I''ve almost completed the build of my M158, and took it for it's first spin today. We put the engine together fully expecting piston slap as the clearance was well over service limits and sure enough it sounds like it's got a bad case of it. It's going well enough, first time I've ridden a Sherpa 250, very different power to my old 350. It picks up quite nicely at higher revs when you give it the gas, and the engine is turbine smooth. Anyway, I just wanted confirmation on the piston slap diagnosis from the experts on here. Cheers

A couple of pics of the Motak Racing Sherpa 280,bike will be at Telford.

Just added a fine running 199A to collection of trials bikes. I'd like to update this one without going too crazy. I will be riding it here in the USA in vintage and AHRMA. I really don't think any modification is needed to be competitive but in reviewing the forums, the following modifications look interesting to me. Move foot pegs back and down. Modify the handle bar mounting to eliminate the "tiller-effect." Add needle bearings to the clutch actuator to improve action. I'm looking for opinions on these modifications and any recommendations on others. Thanks.

Hello all I am new to the forum and joined to get information on restoring my 340. I was thinking about the exhaust and have seen photo's of commerfords/vesty bikes and the puma bikes. If I was going to the bother of fabing up a new front tube would you go for stainless and would you change the route of the pipe.? cheers.

Looking at a Bultaco for sale locally, seller not clued up so can any one identify the model? Cheers John.

Hi All, There are a couple of electronic ignition systems available for the Sherpa, but which is best? Has there ever been a test or are they pretty similar? I would probably opt for a system from Bultaco UK because the guys have been brilliant for parts, help and advice during my rebuild, but what about Rex Caunt? I've seen systems from the States with lightened flywheels which I think I wouldn't want. Or do I? I've read comments here which indicate quite a change in engine characteristics, is that accurate? I don't need lighting. Lots of questions, your thoughts are appreciated. Many thanks.

Just took possession of my new 199B project today. Always had an itch to scratch when it came to the 340, 6 speed Sherpa's. So after nearly a quarter of a century "looking out" for one, I need look no longer. Yeah, there is lots to be done, but heaps of new ideas to try out. Electronic ignition, Dellorto or Mikuni carb, what suspension set up will I go for etc, etc..... Will keep you all updated on here on my progress

hello guys just need some addvice. my gears on my 198A are stiff first is easy to slect 2nd is ok once the bike is inmotion 3thd gose in ok but cluncks and 4th and 5th abit stif. the oil hadnt been changed for awhile i think when i drained it it was black and like water so ive put new oil in castrol 80/90 but still the same. now when i try to put the gears in when the bike is not runing seems to be alot easyer. please dont tell me i have to split the engin. but if need to be i sopose it will have to be done hope not.

Hi I have just picked up a 198a (I believe) It has a square section swing arm and not the round reinforced one you would expect...... Could it be a cross over model from a-b I will get some pics up tomorrow night and pop them up... I was just after some thoughts ..

at last i can start the rebuilt off the 198A hears some photos.

Hi lads ,im very new to this so i would love some help as iv just got a bultaco sherpa 350 1972 that im going to try and restore ,whers is the best place to buy parts new and second hand parts.im in Ireland so UK or Ireland would be fine , thanks for your help in advance

Hi All, i have been fortunate enough to increase the Bultaco collection this weekend. A couple of questions though and hopefully some useful guidance. I purchased the bikes because both my father and i love them, he had them 50 years ago when he was 17ish and for me as an affordable twinshock bike they are my chosen mount . i am not looking to restore to perfect condition just to the extent funds will allow and to be rideable in twinshock trials Anyway one of the bikes is a white framed, Bultaco 340, it has what appears to be normal Bulto forks but on one side has no pinch bolts, Is this correct or is it a replacement fork leg that has not had holes drilled or the …

Hi All, Having had a welding repair done successfully to the clutch casing on my M190 Sherpa a wee while ago I undertook to get the same thing done on my new project (M121 Pursang). (Bultaco fetish? ) Unfortunately the alloy on the Pursang behaved rather badly; I understand that some of the alloys can be a bit porous and absorb oil over the years and this flares up and makes a mess of the weld? Anyway the welding proved problematic and it was a much bigger job than it should have been. It appears that the heat has warped the edge of the casing and as you can see from the photo I now have a small gap, probably about 1mm deep and 5-6cm long on the bottom of the casing. …

All has been going well apart from paint from the tank clogging the carb. I changed all the fluids and put an inline filter in but now it won't start. Plug was oily so I assumed flooding and kicked it over for a while put new plug in and it started second kick. It wouldn't rev and was stuttering a little regardless of choke position. Suddenly it stopped. Kicked it over again and it fired briefly and stopped again. Gave it a few more kicks to no avail and pulled the plug. Really oily again. Any ideas? Cheers. Neil

hi got a amal carb on my 151 and in all fairness its not too bad I was going to service it with new jets gaskets the full works or would you go down the route of fitting a mikuni carb ? also anyone know the size of the needle and main jet as standard ? I think needle on mine is a bit worn any help advice appreciated . cheers

The nipples in my Alpina are eaten away . can anyone tell me the thread size of the spokes ? I measure them at 3.37 mm dia , which corresponds with nothing I can find .

Here is a picture of my brand new Sherpa T. My Dad called me about a year ago and said a friend was selling a Bultaco in mint condition. So off I went with cash in hand. When I got there it was far from mint. But it was all there. Loaded it in my truck and let it sit in my garage for 6 months. It took about a year to restore. New paint everywhere. A lot of polishing (on the bike). A lot of headaches mainly with the swing arm. My wife seemed really impressed with the results Oh well maybe my friends will like it. Critisism allowed this is my first restore. Oh crap im turning into my Dad.

He sais it runs well and is in great shape. he is asking $1250 Canadian dollars . Do you think this is fair?

Hi there: there is a debate in Spain about the model 198B. Some say it never existed, some say there where very few bikes produced and all exported to UK and France, even some say it had only 5 speed, not 6 as the 199B. All the Bultaco documets from the factory disapeared when it close in the 80

Hi guys i'm having some issues getting this old girl too run sweet. Can't get it too tick over for love nor money!!. Iv'e tried adjusting the float level numerous times, it iether bogs and cuts out or just won't blooming start. Any ides would be much appreciated. Cheers Hywel.