it runs good for about 20 to 30 mins then it will start reving up feels like its not in gear i just put a brand new prop on it... changed the lower gear 2 years ago! it will run great idle but any time u give it gas it will just rev up terrible help please
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2004 yamaha 4 stroke 25 hp outboard motor
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Do you have correct prop thrust washer for the brand or type prop you are using? Anything thing mounted to boat that would interrupt water flow to motor?
Scrib an alignment mark across prop and prop nut to see if hub is slipping, if mark does not stay aligned after running boat then hub is slipping.
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