rogerb

Hi Stork955 Thanks for your interest. My carb bolts to the inlet manifold using a 2-bolt flange with a rubber pad between the carb and the manifold. I don't think I overtightened the flange bolts so maybe no effect on the slide. The carb looks original and the slide is worn - so it's done a few miles no doubt! Regards RogerB

Hi Swoosh Dave Many thanks for your suggestions. Did a compression test and managed 110psi when kicked over. Is that OK? Took the carb apart again and found the main jet completely blocked and could not clear it. Other jets and passages found clear. The slide appears worn and when referring to Amal carb website they recommend renewing it - so I've just ordered a new 627 Amal concentric Mk.1 from Amal UK. Would prefer to change the carb rather than crankshaft seals at this moment. Will update you when the carb's fitted in a couple of weeks. Regards RogerB

Hi Felix Thanlks for your reply. I am coming to same conclusion as you - either my rings are worn or the ports may be blocked. Either way it's quite a big job to find out what the cause is. Regards Roger

New Member Group: Members Posts: 4 Joined: 29-July 09 Member No.: 9582 Bike: Bultaco Sherpa Hi All Since my last post I re-assembled the carb after checking all jets and passages were clear. Also float and needle valve looked OK. I managed to fire the bike a couple of times then the engine died on me. Found the HT coil lead to spark plug was broken so bought a full electronic ignition from Bultaco UK rather than mess around changing points and condenser etc. Just fitted that and am getting a good spark but still engine won't fire. I'm getting fuel seeping out around the tickler on the carb but the plug is dry?? Any suggestions? Should I now check crankshaft seals and compression or concentrate on the carb? Roger B

Hi All Since my last post I re-assembled the carb after checking all jets and passages were clear. Also float and needle valve looked OK. I managed to fire the bike a couple of times then the engine died on me. Found the HT coil lead to spark plug was broken so bought a full electronic ignition from Bultaco UK rather than mess around changing points and condenser etc. Just fitted that and am getting a good spark but still engine won't fire. I'm getting fuel seeping out around the tickler on the carb but the plug is dry?? Any suggestions? Should I now check crankshaft seals and compression of concentrate on the carb? Roger B

Many thanks to all for your various replies. I'll look into all of them when I get back from holiday in a couple of weeks' time and let you know outcome. Regards Roger B

Hi Guys I bought a model 91 on E-bay about a month ago and cannot start it. The engine was reported to be a runner - but that's another story! When kicking over I get a god spark - the plug's a BP5ES, but the engine doesn't fire. I've had the carb apart (Amal Concentric) and notice the slide (with needle) is a very tight fit in the bore of the carb housing. I think this could be the cause of the problem and intend to polish up the slide using crocus paper or similar to make it freer to move. Any other places to look? Roger B

Hi I'm Roger B from London and have just bought a 1973 Bultaco Sherpa on E-bay. I intend to use it during Winter for daily commuting into central London (about 14 miles round trip) and also occasional trials. I need to register it and fit lights, speedo and a horn (Halfords bike horn?). Does anyone know where I can get a lighting kit? Also would appreciate your feedback on whether it's practical or not? I realise it won't be very comfortable but it's a short ride. Roger B