9.9T hard starting and black lower plug

rysemus

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Sep 18, 2005
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I have a 1992(?) 9.9t four stroke Yamaha with serial number 6g8l-411214. I’ve only had it for a few months and from the beginning it’s been hard to start. <br /><br />I replace the plugs before going fishing last weekend and had nothing be trouble on the water. It was hard to start (which happened before changing plugs too) and I couldn’t go full throttle while in gear, but the high idle lever seem to rev the motor just fine. <br /><br />When I got home I pulled the plugs to check the condition. The top plug was light brown but the lower was black. Is the lower plug Fouled? Was this causing the full throttle issues?<br /><br />What should I start with to fix the hard starts and the lack of full throttle?<br /><br />Thanks Rick
 
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