Bultaco

Does a 77-78 Alpina frame have the same geometry as a 78-79 Sherpa T ? Looking at pictures of a few frames on ebay the Alpina looks pretty much the same,but I wondered if the steering head angle was different compared to a Sherpa.

Hi there just wanted to check on a bultaco I've recently finished is it as claimed a 1978 machine ? Stamped rm 198 .The stamping looks like it was done by a 5 year old but understand this may be normal .? Thanks ?

Hi I've recently fitted a Mikuni VM26 to my 1979 Sherpa 250 , unfortunately it appears to be run a tad rich. Its running a 35 pilot jet and a 130 main, I've worked the circlip on the needle all the way to the top notch and althought its now running a lot better its still rich and requires very little choke. What jet sizes are being used by anyone else with a Vm26 on a 250?

Over at the recent Bristol Classic bike show in Shepton Mallett, saw this & knew there'd be plenty of you guys interested!!......

Hello. just acquired a nice 198A Just ordering some parts could anyone tell me what fork seals are required. also the mikuni carb is leaking but it is going into the air box taken a pc of the carb seems to be coming from the bottom is it a ball bearing ? I have ordered a new air hose as the one on is split . Any help would be appreciated Greg. R

Can anyone advise the size - diameter and pitch - of the thread at the fork tube top? Need to clean up a little whoopsie and can’t find the size listed anywhere. Thanks in advance . Cheers Paulmac

hello guys looking for some advice on a 198A frame am restoring into the same same colour as a 198 Question is do i powder coat or 2 pk? the bike will only be for show and some road work in summer times. so no mud hear. also any 1 know the colour red for the 198? cheers bondy.

Hi anyone help with the chrome on my forks, just rebuilding a 199 for fun use then when I get the hang of these things again will start in local trails. Problem are the forks! There is some pitting in the chrome, they did not leak any oil when in use (before strip down) but will more use mess up the seals. Is it an expensive job to get them re-chromed.

Anyone help on this one, I have a 198a with an unstamped engine that works fine (but looks like someone has taken the number off deliberately!) found a pair of similar numbered engine "198a" casings to match the frame number, started stripping the unstamped engine that fits into the frame fine and just wondered before I get carried away if all the internals will fit into the "a" engine? I am told that some of the internals are slightly different but not to sure which ones. I think I need a shorter kick start shaft and a slimmer outer casing if anyone can help. Also is it good practice to change all bearings as there is 2 on one side and 1 on the other. Thanks

198A is finished guys sorry for some reason i can't up load any photos. ill keep trying. i can't down load photos from my phone to the lap top so ill try something else to see if it works.

Hi, Just nearly at the end of Restoring my 198A. And I have a problem with the Amal Carb. I cleaned it out after soaking it in parrafin for a couple of weeks and fitted service kit to the carb but the bike will not fire up off the carb. If I tip a little fuel down the plug hole she fires straight away. I have fitted a new needle valve and checked the float is operating correctly, that is shutting off the flow of petrol when bowl is full. I fitted a new needle in the same position as the old one i.e in the middle grove of the 5 grooves.And if anyone has a list of the correct numbers for the jets that should be in the carb that might help. Any help or advice woul…

Hi All Getting on with restoring my Sherpa 198A and currently trying to sort out the carburettor. Stripped it and generally wasn't too bad except for worn throttle slide and a bashed about float chamber. Anyway jets and needle were as specified in the Owners Manual but as general detail is a bit thin I have referred to an Amal Mk2 Technical Manual available off the internet. Totally confused now so I'm hoping forum members can put me right. Attached pdf shows the needle jet, Carb Bits.pdfmain jet holder and main jet taken from my carb. Needle jet is the 2 stroke variety without the bleed hole but according to the Amal Technical Manual (extract on pdf) the m…

hello can any 1 tell me on the clutch weight should there be a spring washer or a start washer cant rember and its not cear in the parts books thanks bondy.

alloy tank back from paint and is finely on the bike with seat.sorry trying to down load photos off the bike but having no joy.

hi guys i have come across aproblem with my crank on my 198A (250) i have put it into the L/H crank case no problems dropt stright in when ive come to bolt both cases toghther the crank is really stif to turn. when i loosen the half case nuts it frees up i have noticed theres a biger gap on the other side were the crank meets the case. so i gess as am tightening the bolts its jaming up on the L/H side so ive strip it all back down. and this morning i have put the crank back into the L/H case but left a bit of a gap has anybody come across this before? are ham i doing somthing wrong? spoke to big john he has told me he has heard of this happening before think he as a frien…

Continuing the Sherpa 198a strip down last night highlighted a couple more things! Both of the 19mm bolts securing the rear (cast) engine mount bracket were tight (didn't check torque), but there was some play allowing the engine to move slightly i.e. being cast the bracket wasn't a tight fit to the engine mounting lugs. I didn't want to tightened further due to risk of fracturing the bracket. Is this play normal or possible due to wear? Exhaust. Both silences are dirty, rusty and oily but externally fundamentally sound. Theres no indication (ie. welding) that they've ever been opened up and repacked, so can only assume they are as original and so will pr…

hi all finaly the 198A is back together just got the wheels back from being respoked. was going to put a new tank on it but i ended up using the old 1 hear is some photos.

Hi all. Thinking about getting the frame powder coated. A couple of questions before I do. Firstly colour? Stick with the blue or go white? There is a frame lock stop missing, so do I chop the other one off or weld on the missing one? Footrests, do I weld on new brackets, for modern footrests, or will modern types fit on existing brackets? Any thoughts on this very welcome, cheers.

Help, I am in the process of road registering my 198 and want to wire in the stop light. i connected to the red wire from the stator, but when i press the brake the stop light comes on but the engine cuts out. i am guessing that the yellow or red wires are from the lighting coil. not getting any voltage from the yellow. My haynes manual only hints at the lighting circuit, can any one point me in the right direction.

Hello ive noticed a oil leak on the rear engine mount its coming from the center crank case with out spliting the engine is there any way I can stop it? Its only a verry small weep I dont really want to split it as its a good runing engine ive only noticed it because the engins been sat on the bench for a few weeks why I have the framed painted.