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Intially it was 100:1 but OMC released a media statement in the early nineties stating all pre-nineties pre-mix 2 stroke engines should be run on 50:1 if the style of use was wide open throttle for most of the time. Reading around the net, it seems that the various grades and types of oil available today, running at 50:1 in an original 100:1 engine, can cause excess smoke and uneven running. It may turn out to be a trial and error method for your specific motor depending on its state of maintenace.
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∙ 15y ago
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