Question about Yamaha YZ 450 F Motorcycles
Are you turning the idle screw or the smaller inset mixture screws?. Check to make sure its not the idle screw. Typically the idle screw will have a spring holding tension against it. Also check to make sure there is a good seal between the carb boot and the Cyl head. It could be sucking extra air past this and causeing the engine to rev.
Posted on Mar 15, 2011
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Posted on Jan 02, 2017
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