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Intake Issues?

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Hey,

 

I just bought a 2000 kdx 220 and have been having some issues. It revs on its own sometimes. It goes beyond warming up. Even in neutral just sitting there it will just start to rev up on its own. It revs all the way up and then drops back down. It may or may not rev back up at that point. It is not the cable or slide. The slide and carburetor are spotless not a drop of ethanol gunk. Any ideas on what the issue is and what I can do. This is my first bike so all the help is appreciated.

 

Thanks

Alex

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Is that an easy and cheap fix? Also is there any other possible issues.

Thank You

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If it wasn't a 14 year motor, some of the first things you'd want to rule out is an air leak at the front and rear carb boots, bad seal between the front boot and cylinder.

Bad reeds.

Air screw set too lean, too far out. Turn it in 1/4 turn at a time to richen, guage results.

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