Bultaco

Hi,How much did the sherpa engine change between 1971 M-80 and later models 72 on? In particular internals ie clutch gearbox etc? Cheers

Hi, got her in bits and removed cylinder head to check bore etc. I noticed that I can rotate the piston in the barrel several degrees. every thing else looks clean, no score marks etc. Is the small end bearing shot or is it normal. I have tried to ease barrel away from cranks but I dont want to use to much force. Any advice gratefully accepted, Cheers, Myson

Can anyone suggest a trustworthy/reliable powder coater to do my 199a frame in the original blue? Preferably in the east anglia/east midlands area. I've tried a few 'well known' ones and they can't do RAL 5015.

My M85 fork tubes are rusted a little where the taper meets the top fork clamp. Can grease or something similar be applied to the taper during reassembly to slow down the corrosion process? or would this make the forks move? Thanks!!

Hi All, After spending lots of time searching the web for info on the older Bultaco 2-strokes, I'm at a complete loss and need some help from anyone who knows about these bikes/motors. What I'm after is some basic cylinder porting information (e.g. inlet port duration, transfer duration, exhaust port duration) so that I can see how the 250 motors developed, specific to their applications (flat-track racing or trials). I managed to find Bell's tuning info regarding the Matador's 150 inlet, 126 transfer & 170 exhaust timing but that's all I've managed to find. Please note that I'm not looking to steal anyone's tuning methods/port timings, I just want to be able to …

I have moved from boxes of bits to what could be called something that resembles a Bultaco m159. I have posted a few before and after photos. I am still struggling to get it running. It started and ran for a few moments but I have not been able to start it since. It has spark but not great and it still has big carb issues. I think I need a rebuild kit for a Bing. Leaking fuel from bowl and out the bottom very quickly (overflow hole). I painted the old fenders with Rustoleum Universal paint for now. I do not hink it will hold up but that new spray paint can they have is awesome to use big fan spray and easily to hold. I still need to order new bars and a new petcoc…

hello everyone,I will try to be clear (my english is not so good). I have a brand new pre jetted mikuni vm26,needle clip is in 2nd position,new ignition stator(wich comes from a 175 lobito,I believe they are the same but is it ok?) 2.4mm advance timing.new piston rings ( stock bore). The bike doesnt run fine and has no power in low rpm in the first 1/4 of throttle.(a bit like a motocross).idle seems to be good,bike starts good 2nd or 1st kick. I would like to know what are the measurements/size of the intake manifold for a 199 (cylinder side not carb side),and what could be the cause of a bad reving. Thanks a lot for your answer.

Hi All, I have hunted all over the forum but can't seem to find the info of specific topic I am looking for so i will ask here. I am trying to decide what would be the ideal size of mikuni VM carb for my M92? Any thoughts out there? Dave

Hi guys, i am continuing with the restoration of my M-80 and am looking for guidance on removing swinging arm bushes prior to grit blasting and powder coating frame and swinging arm. Any tricks or tips? By the way is

can anyone tell me what size ball bearings would fit the original steering head bearings of an M92? Building up from bits and want to reduce costs and re use the standard bearings for now, but the balls are missing. Also what mods are needed to accomodate tapered needle roller bearings? Cheers Hoodie

Fairly simple question but are there two types of fixing the front pipe to the barrel on later 350s? The first one being the sleeve and spring type but is there also a pipe with a captive plate that holds the pipe on against a flanged end?

I have some 1971 Alpina forks and notice that the fork caps are vented so that they will breath in and out as the forks work. I have never seen caps like this. Would it make the fork more progressive if they were sealed..with maybe a valve to relieve pressure? Would it then blow seals?

Nice movies from Spain, thanks to bonaigua E.g. go to 2:49 here: http://www.youtube.com/watch?v=VShRMRZlWzE...feature=related

Hello, A few months back I aquired a '77 Bultaco Sherpa T 350. It is a model 183. Bike came with a street ownership. It is equipped with Headlight, taillight, horn and all the necessary switches and buttons. I'm building the bike with the intent of using it to improve my riding skills as well as participate in the occasional vintage trial event. I've been removing the road going equipment to save weight and prevent any wear and tear to these items. One day when a full restoration is in order I can reinstall these items. I'm worried I may damage an aluminum fender or hard to find/expensive component like the speedometer. I've been tracking the weights of the items…

For my M92 project I have the offer of a barely used Dellorto, from a 2003 Gas Gas pro 300. I havent got it to measure yet but I think the spiggot OD is 31mm. Does anyone know if this is right and what carb rubber I need to fit to the two stud amal fitting? Does anyone in the UK sell a rubber for an amal to dellorto conversion? Cheers Hoodie.

Hi, I need a 12mm swinging arm spindle to complete my 1972 Bultaco Sherpa. Bultaco UK don't have any and don't know when they will make any? Alternativley, any one know someone who could turn down a 14mm spindle?

How do I get the bearings out of the swingarm? Is it all pressed together? Thanks...Dan

Hi All. I have a 1972 Bultaco which has a fully rebuild engine with electronic ignition. But I can't get it to start as it should. If I use Easystart (or brake cleaner) it will fire up and run well. I can turn it off and it will restart 2-3hrs later first kick. But if I leave it overnight, it won't start. I'm using a new BP5ES plug with a 0.7mm gap as per the ignition instructions. What should I try now?

Hi there, Have finished stripping down the front end of the recently acquired Sherpa type 125 and, as suspected, have found that the triple clamp is bent - is the triple clamp assembly unique to each particular type / model of Sherpa or if I find one from another model will this fit (I ask, since there is a complete triple tree from a '68 Sherpa currently advertised on EBay!). If the assembly is unique to this particular model, can somebody point me in the right direction regarding where to start looking for a suitable replacement? Thanks again in anticipation for your assistance. Regards, Richard - Mexico City

Here is my new (to me) bike. It is a 77 350 model 159. It is not pretty but it runs well and will be a good practice bike while I work on it to get it safe and reliable. Since I took this pic it has new fenders and throttle. I had to clean the mag and replace the points because of rust but it now has good spark. I am really enjoying it and am looking forward to doing some vintage trials next season. I hope the pic loads Sam