Bultaco

Can someone please tell me how many ohms the brake light resistor has as used on the Model 85 and similar? Would someone who has such a bike be willing to measure the resistance? Thanks.

Does anyone know the ratio of the AVIS-VDO speedometer drive used on the Model 85 Alpina?

I'm always interested in the way Bultaco changed things on some models without changing the model number. The model numbers that had the most changes are the most interesting to me. I have a fair handle on the changes through model 49 and through model 91/92 but not the others. I'm rebuilding a model 85 at the moment so am particularly interested in knowing at what production numbers the model 85 changes happened? I'm most interested in when the footpeg mounts became welded on, the swingarm pivot nuts were recessed into the frame, the steering security lock was fitted, the chain tensioner became rearward-facing and the chain oiler was incorporated. I only have t…

When I was 15 my father bought a brand new Bultaco Sherpa, needless to say I spent more time on it than he did due to his work commitments. I loved it, super reliable and great to ride. Come forward 40 odd yrs and this (what I thought was a Sherpa) came up for sale locally at a reasonable price. it's all there, yes needs some work and a restore/rebuild but it doesn't look too bad. After checking the engine and frame number it seems it's an early Alpina M-8500619 and 9700356. I have had a quick search and it seem that these early Alpinas are basically a Sherpa with slightly different gear ratios. So here are my questions, I know this is the place to ask. Does it look…

Hello. I’m in France (sorry for my bad english) and I’m almost ready to restart this 188 Alpina. I still have to repair the seat that have a bracket tear off and would like it don't do it again. How this saddle is supported is unclear to me. My understanding is that the seat rests on the frame at the areas I have surrounded in black. The brackets (one missing) that I have surrounded in red are only to avoid the seat to lift up and are not loaded by the weight. Is that the way it works? Furthermore, I think (this is quite clear) the forks of the saddle (surrounded in blue) should be under the frame cross plate. My Bultaco specialist told me the sea…

Curious if trials bikes use a different handle bar than say an MX bike? Are they taller or the same?

Hi all I need to replace the rear shocks, I’m staying with Betor for originality but their website lists black springs for the 213, but the originals were chrome. They do list others for earlier Alpinas with chrome springs with the correct length and mounting size, but will they fit? I have tried their customer service but no help. Inmotion list the same shock for all Alpina models soI guess I should be OK…

Ordered new crank seals but got 2 narrow ones instead of the fatter factory size, am assuming they could not get the original and expect you to double up? has anyone tried this and does it work? Would show a pix, but 25k is not enough for the file size!

Moving at a snails pace due to time and parts availability but getting there. Thought rims were shot but they polished out, powder coated everything I could. had a new skid plate built, still learning a lot as not everything was as it should be.

Hi Guys, Having now fully cleaned up my 198B barrel and cylinder head, the top of the barrel and the underside of the head are stamped 137. It has been over-bored to 73.75 giving 256cc. Do the Bultaco Sherpa gurus suggest my head and barrel came off an older 250 Alpina 137 from 1974/1976? The bike was apparently supplied directly by Comerfords in early 1982 as one of about 110 bikes supplied and sold by them, and was allegedly billed as a 'Vesty Replica' Or perhaps just put together by Bultaco factory using what was just lying around? And presumably over-bored to the max early in its life? Ideas appreciated. Thanks

HI, DOES ANYONE RUN A 250 SHERPA ON A 26mm OKO CARB. IM JUSY TRYING TO GET SOME BASIC SETTINGS FOR IT. THANKS.

Hi Guys, Can anybody suggest the best high temperature paint for exhausts. I have used rubbish stuff previously (from Halfords) which just dissolves when petrol is spilled on it. I even cured the casings and exhausts in the oven to try and get a good result. Don't want to get lumbered with the rubbish stuff again. Also similar suggestions appreciated for high temperature lacquer that will not dissolve. Thanks

Wheels,,, all three of these wheels are bent , don’t know what to think dirt bike used equals # , always check front wheel , up in the air spin around , c k , , and I purchased some tires on flee bay , new , shrink is one brand will never purchase again 2 tires deformed , upon installing , was 50 $ dollar tire new , both same brand deformed ,, upon installing on rim ,, think there made in Asia Taiwan ,, , if I do math that 3 new tires cost 150. USD deformed , upon purchase flee bay , $ and having problem with bent rims ,,,,,, fk fkfk,,,,,, , some of these are for my mk 4 mod 68 pursang , it runs , ,,,,,, CHEERS

just started to work on my second Bultaco and don't seem to be more lucky than last time (still working on the 125 Lobito, will post updates however). The Bultaco starts by kicking. First time using starter-spray. After some time it will still start using no spray... (5 - 10 min. after the use of spray, so none will be left to keep it starting, I supose) but it won't rev up, idles for some seconds (2-5 seconds) and stops. Action on the gas hand won't change anything, kills the engine even quicker... any ideas? We obviously have spark... could it be to weak? So the first steps could be going through the prozess of cleaning the points, shorten all cables, perfection …

Hi all just wondering can the oil in the clutch migrate through the clutch rod tunnel, seem to have a bad leak on the left casing, doesn't seem to be the primary gear oil seal, although it is in that area maybe a seal /o ring missing somewhere along the line. 🤔🇬🇧

Hi all looking for a 199b rear brake drum, not bothered about condition, will refurb. Cheers

Hello All - Well... the time has finally come for a complete engine overhaul. I've been enjoying faultless performance from my 199a for over ten years, with only some minor top end work when she was first purchased. Following a recent timing check and adjustment though, I noticed some up and down play in my main bearings. Not a problem (motivation-permitting)... but, before I begin tear things down, I thought I'd look for a quality replacement con rod kit to have my crank serviced while I'm at it. Any recommendations for the best quality replacement con rod rebuild kit for a 350 199a currently available? My nearest and most favorite OEM supplier here in the …

Installing a new piston in my 199B and it feels like there is some friction with the top end bearing, all new parts, maybe it needs to break in ? feels like it is rubbing on the spacer on the ends of the bearing?

Hi I have an otherwise very good M80 slimline but with a mullered crankshaft. Can anyone tell me if the crankshaft from a 175 Sherpa (M221) will be more or less a straight swop. Thanks in anticipation. Sparks2

I have just aquired this Sherpa "genuine shed find" can any one ID. this machine model year please