See full version: Prop size for 50hp 2 stroke yamaha
I cant really provide that info. Its
a tiller without tach and speedometer. I never gps'ed it. Going to canada next weekend. Delayed because i havent been able to get answers. I will go with whatever the expert opinion is a try that prop
Try a Solas Amita or Rubex 12" pitch prop. A prop listed for your motor will be the right diameter.
When you get settled buy an induction tach like a Tiny Tach Be sure to tell them its for an outboard.
Do some test runs and get us the information.
Its important for the performance and health of the motor that it operates within its rated wot rpm range.
Rpm too low and it will cause poor performance and ,in time, premature repair problems.
Too high could produce engine failure. Have a good time and don't sweat it over the short term.
If the yamaha performance bulletion lists 10 5/8 x 12 for a similar boat that weights 805 pounds for hull and mine is 635 pounds. If boat is lighter, do I go to a bigger prop diameter as in
10 5/8 x 13? more
If you are not certain which replacement propeller is right for your craft, there are several ways to find out. You can use our parts finder, or give us a call and together we’ll locate the best choice for your boating needs. Here’s some additional advice and considerations you’ll find helpful when selecting a spare or replacement Yamaha propeller.
This is the distance a propeller travels in one full revolution. A low pitch provides greater acceleration and a higher pitch has a greater potential for higher speeds.
The blade angle in relation to the propeller barrel/center. This is expressed in degrees. High rake propellers are preferred for high engine mounts. Low rake propellers cause less engine strain. more
Black Max
This is the base-line aluminum prop that might be shipped with many boats powered by this motor. The prop has less blade area and less blade cup than the stainless props, and for those reasons would not take as much trim, either. The Black Max would abruptly lose its bite on the water when it was over-trimmed, and it would slip and let the boat bog in moderate turns unless the motor was trimmed down before the turn. This due in part to its blade shape, but also because the aluminum blades flex a lot more than stainless blades as they load and unload through a rotation. here
My opinion? Unless you are frequently running among stumps or touching the bottom and chewing up aluminum props, you might was well live with the Black Max and pocket the $350 price difference. That’s like a season’s worth of gas. However, if you need or want the durability of a stainless prop, I’d spend $100 more for the Trophy Plus, because you might as well go for the gusto. But you wouldn’t make that choice without actually testing, because you need to feel the Trophy to appreciate its benefits. So before you spend this kind of money on a new prop, find a dealer that will let you do a little testing with your boat and motor.
We changed props on the water to save time. Always have a spare prop nut handy when you do this. They are attracted to water. here
Last summer, in part one of “The Right Propeller” I offered some guidance to Boats.com readers with step-by-step instructions on how to evaluate prop performance. In part 2, we explored propeller alternatives and the effect they may have on boat performance.
But there’s more to picking a prop than just the raw data. Here are notes I made on each prop after I drove the boat. Remember – test results with your boat-and-motor combination might be different. here
Re: Need Prop Recommendation for 90HP Yamaha - Dhadley more
Thank you very much, hwsiii. Just to make sure, the 15" pitch is for stainless? Just out of curiosity, should pitch be similar on ss vs aluminum? Once I get a good prop on there, I will report my numbers again. more
I want to switch to a stainless steel prop and make sure the boat is running at its best, preferably stay with 3 blade. I would appreciate recommendations (fairly new to owning a boat). Looks like I do not have the right prop for the boat, but plan to save the aluminum for a spare.
Dhadley - can you recommend a ss prop for my boat?
Thank you!
bc more