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2007 Yamaha YFZ 450 Backfire


Quad man34
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I got a 2007 YFZ 450 I can get it to start off the starter it turns over by won’t fire and I have to push start it then it runs good but back fires when you let off the gas and then I let off the gas completely it shuts it’s self off so you think that I need new valves or adjust the valves 

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