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It depends on the year and specific model of engine. On an engine before the 1990's it's probably 50 to 1, after that could be 20 to 1. The best thing to do is do a search online for the engine model and year and find the service manual or owners manual. That will give you the correct ratio. Also if this is an older engine ask on one of the website Fiberglassics, iboats, or The Hull truth.

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12y ago
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