yamaha f60 4 stroke prop help

[frankgorshin]

I have a yamaha F60 4 stroke on a 16 1/2 foot G3 alluminum bass boat. Prop is 10x15 alluminum. WOT is between 5000 and 6000 rpm. I can get about 5600. I have been told to go to a 13 pitch to get my max rpm's. Thinking about going to a SS prop. Need alittle advice

 

[Silvertip]

Re: yamaha f60 4 stroke prop help

Go to Yamahas web site and click on Performance Tests. Select your motor, your boat, and view the list of performance tests. Can't be more convenient. They even provide fuel consumption, prop type, and speed data. Pay attention to the engine height setting. Bet its 2 holes up and I'll bet yours is one hole up. Play with engine height and you will very likely get a couple hundred rpm without changing the prop.

 

[frankgorshin]

Re: yamaha f60 4 stroke prop help

Your right mine is 1 hole up. I tried 2 holes up, couldn't turn, prop cavitated too much.

 

[frankgorshin]

Re: yamaha f60 4 stroke prop help

Tried yamaha site Didn't have my boat. Had an eagle 175 with a 75. Mine is a 165 eagle with a f60 4 stroke. Total different setup

 

[karlster]

Re: yamaha f60 4 stroke prop help

I have a yamaha f50 on a 15 foot scout. Mine too had a 10x15 prop and I only got 5400 rpm at WOT. I just purchased a new prop from iboats. It is a 12x10.5 and if I am not monitoring the tach it will easily exceed 6000 rpm. This is actually what I had hoped for as I don't really need top speed but the hole shot and low end throttle response are a lot more useful for me. With the 15 pitch at 5400 I was maxing out around 30mph (gps) and with the 10.5 pitch I max out at 25 mph (gps).

It now jumps on plane instantly and my cruise (15 - 20kts) rpm are in the 4500 to 5500 rpm range which I have gotten the impression is where these engines like to run.

My only concern is the potential for an unaware driver to over rev the engine. My brother took the boat out and ran it up to 6400 rpm (indicated on the stock tach) without realizing he could overrev the engine.

The point to this post is that I intentionally underpropped my engine and am glad I did. The difference in throttle response is night vs day. These aluminum props are so cheap, just buy one and try it out, if it doesn't work the way you want it to I am sure you could sell it easy enough for 80 percent of what you paid for it.

I can't recall the exact figures but after buying the hub, the actual prop is really cheap as it is a fraction of the 69 dollars. Why not just buy one hub and a 11 pitch and a 13 pitch prop so you can prop the boat to whatever conditions you are using the boat in. You could probably get the two aluminum props and a hub for around $110.

I think I paid 69.00 for the turning point hustler prop and 12 dollars shipping. If I did it over again I would pay 12 dollars extra and get turning points newer hub system that uses the stock thrust washer.

Karl

 

[WillyBWright]

Re: yamaha f60 4 stroke prop help

I'd go 2" lower with an aluminum prop, but only 1" lower with a SS. With room for a ton of variances, I find that SS props of the same pitch will spin faster than their aluminum equivalents. That's usually because of thinner blades slicing through the water with less effort. 15's are only good on very light boats with a very light load.

A Stainless may also allow you to go back up that one hole and not lose grip with the water. But with a flat bottom, I'm not too optomistic about that. They are also much harder on the gears should you find a rock the hard way.