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View Full Version : 400ex problem may be resolved...


yamablaster24
11-08-2005, 07:45 PM
Well i took off the head for kicks and there was no head gasket... I think this may have caused the only idling and not revving at all and shooting flames. Do you guys think so?
prepracing
11-08-2005, 11:01 PM
did u actually take off the head ? or just the rockerbox/valve cover ? Alot of machines just run some kind of silicone or gasket maker for the top cover gasket. But I seriously doubt you not having a headgasket because you have to have clearance between the piston and the valves ! And it would never seal off without one. Sounds like u just had jetting problems
04'400ex'er
11-09-2005, 11:44 AM
poping and shooting flames out the exhaust is caused by a leak in the intake or exhaust, or by most commonly by the pilot jet being off. if there was no head gasket then i dont think you would have the piston to valve clearance needed. most likely you have a jetting problem. be more specific about what the bike is doing and i could help you more.
yamablaster24
11-09-2005, 07:05 PM
no gasket between the valves and piston. Thats what it is. I have to order a frekin head gasket!! ahh im so mad.
hotrodbelair
11-09-2005, 07:29 PM
y was it missing a headgasket who did u have build the motor
yamablaster24
11-09-2005, 07:50 PM
its how i bought it
400exrider707
11-09-2005, 08:55 PM
Originally posted by yamablaster24
its how i bought it

Wow that sucks, who knows what else is wrong with it! ..... could this be....karma?!?!?

It's $20 for a thin cometic head gasket from C&D. Did you run it at all like this? You might have had valve-piston hitting if you did, doubtful, but possible.