Bultaco

I looked in the archives but it did not jump out Oil Capacity in cc's for Cota 348 Transmission Clutch "recommended" oil/gas ratio

The rebuild continues but I am struggling with the swingarm bushes on my 350 199A. After trying a Sammy Miller kit which wasn't too succesful I have got a set of Bushes from Dave Renham. I have pressed in the Bronze outers which seemed to take more effort than I thought it should but there is no way the inners will go in without what seems like an equal amount of effort. My assumption is that the outers rotate on the inners is that correct or does the whole assembly rotate on the spindle? Is it normal to need a lot of effort to fit the outers and are the inners normally that tight? All advice and suggestions gratefully received before I have to mortgage the kids t…

Hi guys In my haste to get the rear wheel stripped and rebuilt I neglected to measure the offset. Would be greatful if anyone can let me know what it is.

Hello, I have recently bought a Bultaco with SM high boy frame; I did it not because I hope that his frame is much better than the standard one but because I believe that it is a peculiar bike in trials history. The bike I bought is rather a patchwork: engine, forks,hubs are a nice collection coming from several bikes and so the problem is: how was the original bike? Even I'm not totally crazy about each original screw of the bike (especially when prices are rising at stars) I'd like at least to have the right engine, wheels and suspensions. A fast search on the internet (this fantastic source of informations that so often provide us of good informations) didn't give me …

The carburator of my Bultaco Sherpa T 350, model 199b is retty worn out, the slider rattels around, a lot of whitchpee has left its tracks inside the bowl and the small plastic filters are cracked. Time to get a new carb. I have seen some Bultaco Sherpas, 199A and 199B models in photos from the Spanish Zona Trial and Todo Trial sites, fitted with Dell'Orto VHST carbs. Has anyone did this here in the forum too and have the spec's for jetting? This is the italian atomizer in a picture: Any recommandation or hints? Oh yes, it is a carb with a flat slide!

hi all ive had problems fiting my headsteady i got a brand new one off dave at bultaco uk but when i tryed fiting it it was slightly to long had to make it fit by bending it as anybody come across this problem? the old one that came with the bike was allso bent ive tryed loosening the engine bolts but still didnt work dosant look like the frame is bent can anybody help

Dear All, This is more of an information call than a question. I searched the archive for posts on what RAL number Bultaco Blue is prior to powder coating my frame. I couldn't find any threads with the answer. Dave Rentham described it as Ford Electric Blue but I couldn't find a RAL number for that either. So for what its worth the coater and I agreed to spray it RAL 5015 which is the nearest blue we could see to it on the day. Hope that helps someone in the future. Paul Cundy

Hello everyone, Just finished my 159 restoration. Don't have any pre photo's. But it was in a very poor state. Anyway, hope you like it. Cheers Brian http://yfrog.com/2m1002413sj http://yfrog.com/501002416j

Managed to purchase a standard airbox for my 340 from sammy millers moons ago. It now is being fitted to replace the 325 type. THe only problem i have is the rubbers and circular plate etc. Where can i get them from. Any ideas or pics so i can fab one.

Hi, there seems to be many opinions on this,I am just wondering what you use. I know that I always used filter oil on my motocrossers but others used 2 stroke oil engine oil or gearbox oil. #What do you think? Cheers

Hi All I have just acquired a 1965 Bultaco metisse Model 11 . It's not really a trials subject, but is there anyone out there who can help with advice on this model? Regards David

Hi, just finished pulling apart the clutch and fly wheel (exellent clutch holding tool came from Bult UK yesterday!)) on M80 motor. Does anyone know the correct sizes for the woodruff keys as the ones that came our were decidedly of the home made variety. Cheers

Rebuilt the top end of my 159 engine this weekend but not happy with the fit of the Aluminium thrust washers with the small end. In my spares I have thrust washers with both a large recess and a smaller recess (flange). I assume this fits over the end of the small end bearing which is a single 20mm bearing. On the first couple of fits the gudgeon pin seemed to push the small-end bearing deeper into the thrust washer allowing one of them to fit loosely on the gudgeon pin with no contact on the small-end. Is my reasoning correct that the small end should fit the recess/flange on the washers and that they should both be tight with contact on the small end? This wou…

Dear Experts, I'm in the process of restoring a Frontera Mk11 370. I have also done a bit of car racing where ceramic coating of exhausts is done quite frequently. Its said to increase exhaust extraction but the main benefit is reducing under bonnet heat accumulation. Having burnt my inner thigh on my sherpa recently I am wondering whether to get the Frontera exahust ceramic coated. Is this often done on a two stroke? Is it beneficial? Has anyone got experience of doing it? Any thoughts welcome. Regards Paul Cundy

My Bultaco Sherpa 250cc Model 124 has the original fitment Amal 627 carb which is quite worn. The bike still continues to run ok with it, but I must assume that a better carb would improve things somewhat. The question is though what replacement carb would be most suitable, Amal Concentric Mk1 as now Amal Mk11 as used on the later Sherpa's which I think are stub fitting only Mikuni VM26 I think there is an OKO flat slide available Is there anything else that I am unaware of that may be better than the above, what have you tried and how did it work?

What sort of money would I need to spend to get a bultaco 250 twinshock Not to worried about the year or condition as long as its usable I

Having a very enjoyable ride out at a local twinshock event yesterday, cut short by some horrible clanging and banging from the engine at the end of Lap 3. Symptoms so far kickstart is solid but I've taken off the clutch cover and that will all spin including crankshaft but if I select a gear the back wheel is solid. Assume it must be a gearbox problem.

On my M91, with the clutch lever pulled in, the engine will not turn over when I push the kickstart down. Is this normal? If not, any ideas on what might be causing it? Just to be clear, the kickstart lever goes down (very easily), but the engine doesn't spin over.

Gents, I've noticed on the bultaco brochures (on Todotrial website) that the model series 124 & 150 have 1315mm wheelbase listed as opposed to 1330mm for earlier Sherpas. Can anybody tell me: 1) is that true - ie did they really have shorter wheelbase? 2) if so what was changed from previous models (M91, M80 etc)? Was it shorter swingarm, steeper rake, less offset on the triple-clamps or what? There is a bit of an explanation on todotrial, but its in spanish & I can't read spanish & it doesn't make any sense attempting to translate with my spanish dictionary or with google translation. Can anyone translate: "gracias a un menor avance de horquilla" Any…

Hi all, Coming off of a no throttle condition, my engine goes through a brief "flat spot" where it nearly stalls. Advancing the throttle just a bit farther makes it suddenly 'spring' to life and it runs well from there on up to high RPMs. I thoroughly cleaned out the carburetor, even all of the little passages (all that I could find, anyway) and the bike continues to run erratic at low speeds. A possible clue: Adjusting the air mixture screw on the carb seems to make very little, if any, difference in how the engine runs. I thought perhaps the rubber insulator was leaking between the carb and block, so I tightly wrapped the joints with electrical tape--just as a test. I…