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I have a 1982 Outrage 20 and just repowered with a 150 HP HPDI Yamaha. Can anyone suggest a prop size and pitch that has allowed them to get up to 5500 RPM as recommended by the manufacturer? I have only been able to get 4900-5000 perfectly trimmed. I believe the gear ratio is 1.86. Thanks.

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It would be very helpful if you could tell us what propeller you have now that only turns 5000 RPM and at what speed it does so.

What pitch?

What brand?

What model?

What part number?

Number of blades?

What material is it made of?

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What diameter /pitch? 14 1/2 x 17"

What brand? Yamaha

What model? 60 series?

What part number? 6G545947-01-98

Number of blades? 3

What material is it made of? Aluminum

I was trying to avoid going to stainless because I fish in a lot of shallow rocky areas.

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6G545947-01-98 is actually a Yamaha "M" Series aluminum propeller. It is the aluminum version of their so called Black Steel propellers (actually stainless steel painted black). It is not a bad propeller for aluminum.

If you are wed to using an aluminum prop, something I discourage you from doing, then the next prop to try is a Yamaha 14-5/8" x 16" or 15-1/4" x 15" M Series aluminum prop.

You don't tell us what top speed you are seeing with the 14-1/2" x 17" so I cannot comment on the efficiency of it, but we might expect a drop of one inch of pitch in the same line of propeller to yield a 150-200 RPM engine speed gain.

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Top speed has been 35 knots

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35 knots is about 40 MPH and is very good for a 17" prop on your boat. The propeller slip is less than 7 percent, a relativley low number.

I really think the next aluminum prop to try is the Yamaha M Series 14-5/8" x 16".

If you want to upgrade to a stainless steel prop, you may be able to get away with a 13-3/4" x 17" Black Painted Stainless Steel prop (part #6G5-45978-03-98) becuase the blades will be thinner and allow a few hundred more RPM.