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Discussion Starter · #1 ·
I recently put on a Curtis Sparks Shorty full system and also had a Dyno jet kit installed also on my 2001 400ex.

My question is I noticed some oil or oil like substance coming out the exhaust, is that normal or something I should be concerned of?
 

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Is it coming out or just building up on the inside?
 

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If it's coming out or the rear of the exhaust you may have a bad exhaust valve seal
 

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Is it smoking and what color?If it's white it's just extra fuel.If it's blue then it's burning oil.
 

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Discussion Starter · #5 · (Edited)

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Actually all you need is the valve seals you can do this without removing the head it's a bit tricky but it can be done, I used to do it on cars. you have to maintain air pressure via compressor inthe cylinder to hold the valves up or you can put the piston at TDC and get an extremely long rope like lawnmower rope and stuff it in the cylinder leaving a tail to remove it. Done that too. It keeps the valve from dropping out when you remove the springs, If you do it that way or anyway make sure you put the tightly wound coils toward the head.
 
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