400ex problem

[bjg696]

I cant figure out what the problem is with my 400. It runs fine until it gets hot then it starts back firing and you cant put any pressure on the throttle or it will cut off. Ive changed plug, coil, plug boot, cleaned carb and air filter.It just strted doin it and idk what else to try. What yall think?

[rob_990]

rejet or maybe install a fan if it only does it when it gets hot

[Ryan'07400ex]

Originally posted by rob_990
rejet or maybe install a fan if it only does it when it gets hot

he already has a fan and air scoops it says in sig.

maybe turn fan on earlier to keep it from getting hot

[xcracer416]

rectifier, or stator? what color was the plug?

[sprayedgt]

What are the oil temps when this happens? You have a digital dip stick so look at it and see where it's at and either rule out overheating or know it's an overheating problem. To me it sounds like a lean condition. Possibly got some dirt in one of the jets.

[bjg696]

The fan runs all the time, i cleaned the carb so it has no trash in it. has been running fine, just started all of a sudden. Idk have to check overheating, but its not jetting.

[ae13291]

sounds like its detonating to me, try using a colder plug or retard timing