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Shane_Bettin

yz400f running lean

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ive got a yz400f that was running really good up untill a couple of rides ago. out of no where it just started running lean according to the colour of the plug. i torn it down and i found that i have an exhaust leak where the header connects to the pipe. im basically wondering if a lean situation caused by an exaust leak will do damage to the engine?

thanks

shane

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