Should the engine is not thru-bolted towards the transom, be sure that the engine mount screw clamps are protected and tight To test the prop, operate the boat at WOT and notice the maximum engine RPM on a tachometer. https://qasimhklt948624.pages10.com/the-greatest-guide-to-refurbished-outboard-enginesfishing-boat-outboard-motor-65854676