Quote Originally Posted by mjb929rr View Post
I also have the 16x15 off of my old sl. I was going to try it but on our older 450 like you said It was almost no difference from the 13.9. I think I’ll go ahead and pick it up and give it a try. We have a lake that we occasionally go to that is 6000’ so I’m sure the 13.9 will be best there. However the one we spend most of the time at is around 2800’ this is where I’m thinking the larger prop will be better.

I wonder if your upper rpm issues is related to fuel. I know here in Colorado 91 is the max we can get and I believe it prefers 93. If that’s the case it could be knock sensors pulling timing to protect the engine.

I’m not sure why they changed the ratio on the 550, I wonder if it’s a supply issue and that way all the engine options are the same.
I’ll order it and let you know.
Tige runs the 2:1 on the 575 and run 16.5” and 17” props.

The lower gearing works.


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