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This is a non-invasive, pre-purchase inquiry.

I recognize it’ll need a rebuild again, and maybe again. So do aircraft engines. Used to that.

Just looking for guidance.

If the dang thing seems to run real good right now, with that many hours (~150/350) should I *normally* expect a rebuild RIGHT NOW, SOON, or after 200 more hours?

Fir instance, I have NEVER had to have my Stihl chainsaw motors rebuilt. Ever. Many a bar, chain, pull cord and spark plug, but NEVER the engines.

Just don’t know jack about these Yamaha waverunner motors.

I keep three 4,5,&6 Hp Yamaha two-stroke long shaft outboards going as part of my local sailing adventures. All three powerheads have been rebuilt in my dimly lit bug-infested shed from time to time, and all three have gone underwater from time to time, and suffered so many indignities and mix-and-match repairs that I truthfully do not know which is which, but there is always one hanging on the transom. Parts? Piece'o'cake off the web. The exception, shear-pin propellers have gone the way of the dodo, so I change the final drive pinion to the type that will accept the dratted rubber hub type (not a Wave Runner issue). Use NO ETHANOL gas and real good 2-cycle oil (Mine all are 100-1 mix. A teentz more won't hurt)

The Yamahas run as required, and when they don't, which is rare, well it is a sailboat and the prevailing wind is a westerly that blows me home, so all I really need is power to get out, as long as Wave-Runners don't wake-blast me in narrow channels!