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Hi guys I'm working on a 2007 raptor 250 when u start it up it back fires in the carburetor when cold once you worm it up it starts having Reilly high reving I sprayed starting fluid all around the motor to test for vacuum leaks did not change and cleans carburetor please help
 

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It sounds like you need to clean the entire fuel system, dump all the gas out and clean the carb and see if that fixes it.
 
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