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Message: <blockquote data-quote="poorthang" data-source="post: 488434" data-attributes="member: 31585"><p>lots of folks dont know that ALL engines have an rpm range that goes through an imbalance. usually at the very bottom or very top of the scale. size of balancer can narrow that range quiet a bit but there is a negative to making balancers larger. most two strokes have the imbalance at the bottom of the rpm, and most 4 strokes will have it somewhere in the lower range. i guess that with a small outboard, which may be used for trolling, and is most efficient at peak of torque curve will have that imbalance somewhere between the most used rpms just as DaleH said above.</p></blockquote><p></p>