Bought a new pair of 2 stroke 70's four years ago. Have used yamalube, marine nonethynol gas and Yamaha gear lube exclusively. Cruise at 45-4800 rpm. Change plugs annually, fuel filters every 100 hours and water pump regularly. At 400 hours a cylinder failed. Every 100 hours prop seals fail. Cavitation plate cracked for no apparent reason. I have bought a third engine for what it cost to maintain these two in four years. Had enough. Yamaha tells me how sorry they are. Time to leave Yamaha to the wealthy.

Asked by Jay on 02/03/2013 0  Answer

ManualsOnline posted an answer 10 years, 8 months ago

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