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Old 08-31-2015, 08:13 AM
Gray Beard
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Join Date: Apr 2003
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You will never see that type of chart, there may be a size conversion chart out there? That old rule of thumb is a hold over and no one has paid any attention to it in a decade. It's from the time that four strokes first came out. They were very under powered and low on RPM. Over time they have caught up to the two strokes, they will never be the same but that old rule no longer works unless your like me and rebuilds a lot of the old ones. I no longer rebuild anything except the YS so the rule still doesn't work for me.