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I'd guess about 80/85 MPH depending on conditions and the state of tune of the sled. I believe these sleds respond well to a thinner head gasket to boost compression and also reed spacers. If you do the head gasket mod you need to run premium fuel.

You might want to try checking the tech sections at www.totallyamaha.com
 

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u should run premium fuel anyway most sleds on the inside of the hood say to
 

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I'd only suggest running premium fuel if you need to. I run regular in all my sleds.

I was talking to a mechanic for a factory motocross team and they run the lowest octane fuel that they can get away with without experiencing detonation.

Ken
 
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