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Message: [QUOTE="whenfoxforks-ruled, post: 1395394, member: 73147"] While I have never tried straight pre mix oil before, (man at the hp increase!) I do know a guy, he tried blocking off the jets to see the difference? The engine WILL draw fuel some how, and through the damnedest places? I have yet to hear someone yanking the right crank seal and running straight pre mix oil in the tranny? Back to the issue, an advanced ignition could be an issue for high revs? What does the plug say? You should be able to tell if its lean from fuel or timing? Or just something hanging the throttle? [/QUOTE]