Can I fix it or should i let the shop work on it?

[DAFBFD58]

Hey all, got a problem. Just got back from my deployment and picked up my quad from my buddie. They had it running after they flushed the old gas and it was running fine, but now it wont run. If has a fresh tank of gas and the bat is charged. It will turn over every once and a while but only for a couple piston strokes and thats all it does. There is gas fumes coming from the pipe and its fully charged up and I have no other clue why it wont start. ANy ideas.

[Fat Possum]

Air, Fuel and Spark, bud.....I'm guessing you've got good air, (no obstructions, Filter hasn't disentegrated and sucked into carbs), you say you've got good gas. (assuming you drained the tank and the carbs.) My guess is, your buds fouled the plug running the old gas through it. If a new plug isn't an instant fix, perhaps you'll need to clean & adjust the carbs?

[2004TRX450R]

I'll second that. Start with a new plug. If that doesn't fix it start tearing into the carb provided you know what you are doing.