Re: valve job
I agree with Sprid. Compression should be 155 to 175 lbs (with good cranking battery and throttle at wide open). Is the spark plug oily/fouled? Are you useing a NGK BPR2ES ? I've not had to change alot of valve guides, Yamaha's only came with a valve stem seal on the intake, but the exhaust is machined for one, so when rebuilding, put new one's on both. Good luck
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