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7/23/2013
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Farmville, NC
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sgrimmxdad
1/14/2018 1:49pm
1/14/2018 1:49pm
We just put a carb kit and a FMF slip on my 08 CRF450. If I understood FMF right we shouldn't have to rejet for just the slip on. The fuel screw is very sensitive, if I turn to far in it pops terribly upon decel and you can see a flame coming out. If I turn it out bike runs fine but fouls plugs within minutes of riding. Put a new plug in and adjusted fuel screw to where no decel pop and bike ran perfect for three laps. My son went to roll a table top, said when he pulled in the clutch the bike shut off and will not restart.
Like I said with a fresh plug bike runs great and fires right up.
Like I said with a fresh plug bike runs great and fires right up.
Decel poping can be caused by and bad exhaust gasket/seal at the head or at the joint of the head pipe to the slip on.
Also, adjusting the fuel screw to correct for the poping will make it too rich. You should be about 2 turns out from sealed.
Paw Paw
The Shop
Upon talking with my mechanic at the shop yesterday I am suspecting the bowl gasket as well we are going to take it down today and check!
Thanks for the replies!
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