CONTINUOUSWAVE

Jim--I have the K17 steel propeller. When I did the measurements I put a level on the -[anti-ventilation] plate and leveled the trim. I then took a straight edge laid it on top of the cavitation plate and extended it to the back of transom, then I measured from the straight edge to the bottom of the...

I have a 1990 Boston Whaler Montauk 17' with a 1990 Yamaha 90-HP two-stroke-power-cycle engine. When I purchased the boat the engine was mounted in the top hole [which is probably the lowest position--jimh]. Judging by the installation it might be the original mounting height and probably was used t...

Thanks Jim, when I get everything finished and running I will send some pictures and a report of how things turned out.

John Donovan

Thanks for the reply from you both. I was working on the Yamaha today and cleaned up the prop. It doesn't look too bad, it had K 17 engraved on it and is stainless steel, it must be the original. The information you gave me will give me an idea of what to look for at WOT, so I will know that the pro...

Phil—thanks for the reply.

I forgot to ask what RPM at WOT is best for this engine and the expected top speed.

What is the best of the 4 props you recommended.

I am looking for the most fuel efficient of the four and am not looking for high speed .

John Dooonovan

I have a 1990 Boston Whaler Montauk 17 with a 1990 Yamaha 90 HP 2 stroke. I just bought the boat used and would like to know the correct pitch and diameter of the prop, stainless or aluminum, and the best recommended brand for this application.


Thanks John Donovan