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Old 06-06-2003 | 05:52 PM
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Richard L.
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From: Renton, WA
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It could be just that batch of fuel. What's the batch number? The same thing happened to my YS .63 when I switched to a new gallon of Powermaster YS 20/20. The engine ran fine on the previous gallon. However, it started detonating when I began using the new gallon. The knocking noise was so bad that I had to run the engine richer than usual.
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