skippy1234 Posted June 5, 2009 Report Share Posted June 5, 2009 hi new to trialing i have two yams and one will only run with the choke on is the carb naff or might it be something daft cheers mick forgot to say its a ty250 twinshock Quote Link to comment Share on other sites More sharing options...
jon v8 Posted June 5, 2009 Report Share Posted June 5, 2009 Either blocked jets in the carb or the engine is pulling in air from the main bearing seals,inlet rubber,base gasket etc. Quote Link to comment Share on other sites More sharing options...
old trials fanatic Posted June 5, 2009 Report Share Posted June 5, 2009 I know this sounds daft but it has happened to me with a TY 250. Make sure the carb airscrew hasnt fallen out, it happens, and also check that the feed from the oil pump, if it has been removed and the bike converted to pre mix, has been blanked off properly. I'd agree with the previous c\omments but worth trying the obvious ones. Oh yes also check the inet manifold for air leaks. Quote Link to comment Share on other sites More sharing options...
tony283 Posted June 6, 2009 Report Share Posted June 6, 2009 Most likely cause is a BLOCKED pilot jet. Tony Quote Link to comment Share on other sites More sharing options...
skippy1234 Posted June 7, 2009 Author Report Share Posted June 7, 2009 hi all i replaced bottom top and reed gaskets still the same air filter then i noticed a little jet in the carb i missed the first time round guess what it was blocked it is sweet as a nut now thanks for all the replies cheers mick Quote Link to comment Share on other sites More sharing options...
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