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    1998 Yama 9.9 4 stroke making oil.

    1997 Yama 9.9 HP 4 stroke, making oil? Operating 7 hours gained 1/2" in reservoir smelled gas. Majority operation trolling, a lot. Problem glazed cylinders, bad rings? I used a de-carbonizer and didn't help. Did any experiance it. Thanks, Yambutt
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