wont start

['2400ex]

i just had $800 worth of work done to it. Took it out and rode it for an hour. Now it wont start. It is trying and turning over. but it seams like no spark or gas is geting to it. But that is not what the spark plug says? please help!!!!!!!!!!! 2002 400ex

[2004exrider]

More info, did it die after riding it for an hour? Also, what are your mods you have done to it, whats your jetting set at. Have you tried a new spark plug that will do wonders sometimes.

Jimmy

['2400ex]

new plug, slip on muffler k&n jet kit w/air filter but ran perfect be4 went into shop. All that stuff was on be4 it went into the shop. they put in a new camchain and plug. But it died after i had turned it off for the night. It was the next day i noticed the problem.