hightown Posted May 1, 2011 Report Share Posted May 1, 2011 i have a bultaco 198a 250cc it will start with the choke on from cold after two or three kicks, after it has warmed up if i stop to look at a section for four or five minutes i have to use the choke again for it to start, is there anything i can adjust it to start without the choke. Thanking you in advance hightown . Quote Link to comment Share on other sites More sharing options...
smelling123 Posted May 1, 2011 Report Share Posted May 1, 2011 i have a bultaco 198a 250cc it will start with the choke on from cold after two or three kicks, after it has warmed up if i stop to look at a section for four or five minutes i have to use the choke again for it to start, is there anything i can adjust it to start without the choke. Thanking you in advance hightown . Hi Mate, Putting the choke on richens the mixture - so you can probably assume that if you still need it when the engines fully warm, then the engine is running too weak when warm. This could be a fault (like maybe a worn slide passing air - they do wear badly on those carbs) or maybe could just be adjusted out. The pilot screw (side of the carb)can be adjusted - try screwing it in 1/2 turn at a time to richen it - the standard setting is 1 and 1/2 turns from fully in (so checking it would be a good starting point). You could also maybe try a pilot jet larger - this will only cost a few quid. I have heard that modern fuels can require a richer carb setting... hope this is food for thought. cheers Stu Quote Link to comment Share on other sites More sharing options...
bultoboy Posted May 3, 2011 Report Share Posted May 3, 2011 Also look on your needle postion......i have a mk2 and the three notches on the top of the needle can make a difference. Quote Link to comment Share on other sites More sharing options...
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