Bultaco

Just purchased early short block .. by what info bultaco listings mf 1960 62 ? Engine numbers on engine m204125 , purchased 325,00 usd . Just engine short block most complet I saved from parts bin , Very similar to model 4 matador I have ,, it’s 155 , just before 200 , ,, some internet listings 2000.001 to 206.916 or 204.058 ,, think there was different models of 155 , there so old only old brochures , and few museum show bikes around , ,, there some in Spain for sale Ho I concerning building 214 frontera engine , , there no trans , , any recommend , close gearing , ratio, or maby pursang , have others will look through my boxes , , just picked frontera on fl…

hi there as old story goes I've come back into trials at a more mature age after my hay day on a Whitehalk ty ?. brought this 250 bultaco I'm preparing and not sure of model if some keen eyed exspert could let me no thanks?

Ok guys I've taken the plunge and bought a early bultaco, as far as I know its a 71 (k reg) but it needs setting up correctly, it starts but its woolly! as in the revs are all over the place! It seems like air is entering somewhere. The inlet manifold rubber and the airfilter hose has got some splits in them? so these will need replacing for a start! An amal carb 627 type L428 is fitted and looks quite a new one! Is this the correct carb? whats the correct spark plug and ign timing? Also I've included some pics as the front brake is much bigger than standard it looks like a mk1 cota front wheel? what do you think? I've had a m80 front wheel in the garage for ages (lu…

At the recent Telford show there was a Bultaco trials bike with a chromed frame standing next to a Model 10 near to Dave Renham's stand. The front half of the frame looked std Bult but the rear was quite different, do you know the make of frame or reason for its modification.

Hi,i'm rebuilding a 1975 151 and would like to know if it had any swinging arm seals fitted when new,when i stripped it down there was none. Cheers Ian.

How to check the crank big end for ware ? , It feels tight and no play , also the side movement of the Con rod is just over 1 mm , I will replace the small end . is there any other way to make sure all is ok before I rebore cylinder and rebuild the motor , thanks

My 159 after going out for a days ride then home for a good wash and polish!!

I cannot find a front brake stay for my 159. I think the material is 4mm thick aluminium. Does anyone have one they can measure approximately and add those dimensions to a picture if they are able so that I can fabricate one. Alternatively if anyone has a spare hanging around I would be happy to buy off them. Cheers, Neil.

Hi, I'm Scott from the UK, I have just recently signed up on here, I am in the process of restoring a 1976 bultaco 159, I'm wondering if anyone would know the steering bearing number, this is the upgraded taper bearing and race? id like the number to I can source one from my local bearing shop.

Morning all, I have a 175 sherpa in the shed (engine number starting 221) that's been there for 5 years that I feel I must do something with. It started off with the usual scenario of buying a bargain that turned out to be a wreck. Bike was stripped by me and it needs all the usual parts ie rod, mains, piston, rebore etc. On reflection I didn't pay a lot for it so it's a case of do it and ride it or chuck it on fleabay as a project barnfind and put it back into something else. I had largely forgotten about it as I have a few bikes, but what changed my interest was that recently I went to a trial and saw a guy on a blue tank 350 bulto doing really well which made me w…

Hi guy's would any one know what size nut and bolt is required for the rear engine mount, just got the bike today and realised that the bottom bolt and nut are missing. Cheers John.

Just starting to rebuild my dads old 191, he got it in 78 nearly new. The frame is red but all the pics I have seen have a silver frame, what color should it be and what is the colour code? Also looking for a manual?

Hi to all, Just recently acquired a Bultaco 250 1978 198 and to be honest I dont have a great deal of experience or knowledge of the bike. Hopefully with time this will improve. My question is a simple one really, could some one give me the fuel/2 stroke oil ratio that I should be running with this bike. I have read 20:1 in an old manual, is this correct? Please forgive such a simple question. Many thanks. Marty Dunn

Hi, i have what I think is a 198, the frame number starts with 198 and then some numbers. The bike has the alloy bashplate/no frame rails at the bottom. Am I right in thinking the bashplate model was 198A and 198B? If so maybe mine has been converted - if it has then its a professional job and looks very much like others I have seen so Im not worried but it'd be nice to know. I'd have expected the frame number on a 198A or 198B to start with 198A (or 198B) not just 198... Any ideas? thanks

Is there anyway to save these tanks? Mine is really bad, the brass insert for the petcock spun out of the plastic. New tanks are such crazy money, have any of you figure out a way to fix/repair/restore these tanks?

Where can I get a piston for a 198a bultaco it has a bore of 71mm. Thanking you in advance. Hightown

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 ..

Hello, What is the height of a bultaco sherpa 198A (72mm) piston. I would like the height on the intake and exhaust side (X= and Y=) thank you so much

I bought my late friend's 198A and want to finish the restoration. He left instruction that the front wheel spacer was the wrong one. Can anyone tell me the correct dimensions for this spacer or better still, where I can get one? I have an ocean of new and used parts that came with the bike but not that particular spacer! Any help would be much appreciated.

Ive had my 198b barrel rebored but the guy who did it had an accident with it and had to resleeve it. Im just wondering if anyone could supply the port measurements so i can check that these are correct. Big ask but someone might have a barrel off for restoration