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Message: <blockquote data-quote="airshot" data-source="post: 514584" data-attributes="member: 1183">It is the thrust difference not the weight. When the Jeff says 10 up then that is the max thrust it can handle safely !  What your saying is....if they made a 109 up motor that weighs the same as a 10 hp, that would be OK ??God forbid any type of accident you might be involved with ( even not your fault) being overpowered automatically puts you at fault for negligence !!  Not worth the gamble in any way.  A good 9.9 should give you all the power needed to get up on plane and still be safe.  However, being a two stroke fan myself, I would opt for a nice 9.9 two stroke, lighter, faster, easier to service !!</blockquote>