[agentbad]

Originally Posted by Motofool

I have never seen that washer.
Here you have some ideas for improvisation:
http://www.advrider.com/forums/showthread.php?t=627031

These materials are excellent to resist gasoline action:
Neoprene, Buna-N Nitrile, PVC, Neoflon®, Viton®, Fluorel®, Urethane and Nylon.

Thanks for link. That washer is the OEM washer and looks like it's just standard nylon. I am going to try and track one down.

Found the washer at lowes that's almost identical and nylon. Ran seafoam right into the fuel line and let run for a bit. Added some fresh gas then took it for a ride. Mid rpms are still not there so it looks like surgery on the carbs may be inevitable.