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jetting 2007 yz450

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i need help i finally got a chance to ride my sons 2007 yzf450 i was not impressed seemed slow on throttle response does not seem to have a lot of power on accel we have ben runing race fuel 110oct the end of the pipe is chalky looking and when you are accelerating you can really here it sucking hard from the air filter box carb is still in factory jetting i think it is lean but not sure what do you think any help would be appreciated

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You are rich especially on race fuel. I live in Jersey sea level very hot. I am running 50 pump 50 AVGAS. Stock main is a 160 ,I am at a 155 ,needle stock and a 42 pilot.If you are at the same altitude try that.

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the 110 ocatne fuel is most definately slowing it down.it doesnt need any where near that octane.

the "chalk" is lead deposits.

its definately not lean.

put some premium pump fuel in it and give it a ride.

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thanks i will try that to see what it does do you think that will take care of the sucking sound in air box if it was a car i would say it had pluged exhaust or is this normall????

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