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Removed the carburetor for the second time tonight and cleaned per. the carburetor cleaning thread (THANKS FORURM MEMBERS!), anyway I soaked the parts in carb cleaner and destroyed the little O-Rings. Are the very small O-Rings necessary for the Carburetor to run properly? There are two; one on the main jet housing/seat and one on the Pilot Air Adjustment screw. Also I have seen 1-3 turns for the Pilot/Air screw; what is the best for a 1998?
 

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The O-rings are necessary. I am running my 98 at 2.5 turns out, however that may not be ideal for your bike depending upon your jetting, altitude, and riding conditions.
 

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Yes, the o-rings are necessary. Good hardware stores have Viton o-rings, which are okay. Fluorosilicone (FVMQ) and perfluoroelastomer (FFKM) are the best o-ring materials for gasoline AND alcohol resistance.



More than you ever wanted to know about o-rings here.
 
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