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[QUOTE="crashing_sucks, post: 1209649, member: 74634"]
I still haven't had time to tear it down (working on getting the engine back in my CR500 this weekend) but I did have time to put a new plug in and do a test of the WOT jetting.  When I checked it before I didn't use a clean plug, oops.  The main was a 148, I threw in a 165, did another run, the plug still looked white.  I then swapped in my biggest jet, a 172, and the plug still is pure white.  What could be happening?  Maybe a crank seal leak leaning it out?  Now that I see how lean it is I'm amazed I didn't burn it up on my last ride where I was holding it full throttle so much.

Doesn't a 172 seem like way too big of a main to be running in this bike?  It has the airbox cover removed, a vforce reed cage, and fmf  gnarly pipe and silencer, from reading other posts I expected something around a 165 main, but didn't expect a 172 to be so lean the plug is still white after a good 6 seconds at wide open throttle.

It also sounds almost like it has a rev limiter at high rpms.  These bikes don't have a rev limiter do they?  Could this just be a result of being so lean?
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