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  1. Proptimus Prime

    650/X-2 Completely new 650sx ported engine. High compression head. Need advice for break-in

    Hey guys, this winter tore apart my old 650 motor and have replaced every part with any upgraded parts I could get my hands on. I bead blasted and powder coated just about everything I could. Bottom line My new motor is a ported cylinders with new sleeves on a stock bore with a high...
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