He got his 400EX about 3 months ago. He went riding it the other day, all day. Took it to his truck to load it up and it would restart. It has fire, it has gas. What could be wrong?

 

Thats a tough one with so little information.
Hmmm...lets see....make sure he don't have a loose intake boot. Did he make sure he was'nt low on fuel? Is his gas cap clogged? Is the air filter very dirty? Is the engine on/off switch in the "on" position (I hate too admit I have done that before)? Next, I would clean the carb....especially the idle circuit.

 

I betcha a 6 pack it's the spark plug.
hard to believe, but 4 strokes do foul plugs.
Happened to me more than once.

 

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Maybe he has a dead battery, unless that's what you mean by "Fire", or then, he might have a bad starter relay, I had one of those on my old 300EX. I hope this might help.

 

Is the gas on off?

 

When I say it has fire. I mean there is a spark at the plug. It cranks, so not a dead battery or starter. There is a very good spark in the plug. Its getting gas, you can smell it when the plug is out. It should start and run, but doesnt. Any other ideas?

 

I feel for him but we got one thast 2 years old now and its been down for 6 months doing the same thing, we cannot figure out whast wrong with that thing, we finally got mad and went and baught a new one, i guess that one will be a spare if we ever get it running!

 

on the clutch side, make sure the kill switch is in the middle lined up with the white line. Have to cover the obvious first I guess........