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Discussion Starter · #1 ·
Hey there, this is my first post here :thumb:

I have a 2002 Raptor 660, and I was wondering if anyone knew the valve timing and overlapping.
I am going to build an exhaust for my bike this weekend, and I would like to now the timing for back pressure and pipe size reasons.
(I know that a 4-stroke engine doesn't need back pressure, but it might be tuned for a certain pressure, Understaning Exhaust)
 
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