jgm Posted March 17, 2014 Report Share Posted March 17, 2014 (edited) Just bought a 1981 jumbo bike runs fine for fist half hour the cuts out at low revs.It then will only start using the choke. It runs ok at high revs but cuts out at low revs. Anbody got any sugestions wether the problem is carb,coil or condensor. Any advice appreciated. Thanks JGM Edited March 17, 2014 by jgm Quote Link to comment Share on other sites More sharing options...
b40rt Posted March 17, 2014 Report Share Posted March 17, 2014 Have you tried a new plug ? Is it the correct one ? Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted March 17, 2014 Report Share Posted March 17, 2014 pilot jet blocked or mixture screw set incorrect Quote Link to comment Share on other sites More sharing options...
jonboy883 Posted March 18, 2014 Report Share Posted March 18, 2014 Definitely a carb issue, electrics are not to effected when the engine is warm, but the fuel/air mix is... Have the carb sonically cleaned and get a new jet kit for it. Is it the dell'orto, if so all parts are available online..... Quote Link to comment Share on other sites More sharing options...
b40rt Posted March 18, 2014 Report Share Posted March 18, 2014 Definitely a carb issue, electrics are not to effected when the engine is warm, but the fuel/air mix is... Have the carb sonically cleaned and get a new jet kit for it. Is it the dell'orto, if so all parts are available online..... Electrics can be affected by heat, particularly condensors and coils. Quote Link to comment Share on other sites More sharing options...
feetupfun Posted March 19, 2014 Report Share Posted March 19, 2014 may also be restricted tank vent Quote Link to comment Share on other sites More sharing options...
mudyman Posted March 23, 2014 Report Share Posted March 23, 2014 All things mentioned are possible so start at the easiest bit "plug" then go on to the condensor and points. When not better get the carb off. Quote Link to comment Share on other sites More sharing options...
jgm Posted March 23, 2014 Author Report Share Posted March 23, 2014 Thanks for all the advice.checked points and codensor, put in a new plug and cleaned all the jets in the carb today. Bike seems to be running OK again. I will remount the condensor under the tank next if any further problems. JGM Quote Link to comment Share on other sites More sharing options...
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