i need some dirt bike help.?

If you have spark and the fuel is flowing it could be either a blockage in the carbs or a timing problem. You did not say whether you had looked at either of these I think it is more likely the carburettor.
 
ok, i have a yamaha 1982, xt125j dirtbike. it will not run. i just baught a new kick start, and i need a new kick spring because the kick start wont spring back up once kicked. i tested for spark and the spark was present. the lights and horn work when kicked, but it wont stay fired. i need some help tryin to figure out what it is. i also just drained the gas and am putting in new gas tomorrow, but it was new gas. can you help give me some options for what the problem is
 
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