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Discussion Starter · #1 ·
I'm new to these forums but if anyone can help it would be greatly appreciated. I have a general idea of what's happening but idk what it is. I have a 2002 400ex and with the 4 valve caps off it will start and run all day long with ease but the moment I put the caps back on it dies and won't start at all until I take the caps back off. it acts like it wants to hit but won't it just smokes out the carb after a while of cranking and smoke out of the valve cover when I take the caps back off.
 

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Discussion Starter · #3 ·
Actually I dug a little deeper in the motor I took the head off and the brand new piston I just put in it had a Crack completely across the top of it but has no visible place where anything has touched it. I believe it was just a bad casting
 
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