what pitch 90 hp Honda Tiller

[donredcedar]

I've got a 90 Honda tiller on a 185 TP Alumacraft (2007). I'm only getting 5000-5200 RPM's at full throttle with a 17x13 1/4 stainless. Same thing with a 17 ptch aluminum prop. It will go about 31 mph with 2 people & a full tank of gas. Should I go down to a 13 pitch or I've heard of people playing with the height of the motor. I hate to loose any more speed, but maybe I will have to. Any suggestion's ?

You can try raising it one hole, but I doubt you're going to accomplish the recommended 5800rpm's. Which brand prop are you using? Dropping pitch will help you get the 5800rpm's, but at a loss of speed.

[donredcedar]

The stainless 17x13.25 is a Honda prop (really a heavy prop). The aluminum is a Rubex 3-blade 17x13.25. I checked the height of the motor & the lowest cavitation plate is about one inch below the lowest part of the bottom of the boat. Do they make 4 or 5 blade props for a 90hp & what do the extra blades do for rpm's? I think the 185 TP Alumacraft weighs 1300 lbs without the motor & etc.

Originally Posted by donredcedar

Do they make 4 or 5 blade props for a 90hp & what do the extra blades do for rpm's?

More blades, less rpm's. You might have to try a 15 pitch.

[PRD1]

Don,

I have a 1775 Pro V Lund with a 70HP Johnson two stroke tiller. Pretty much the same symptoms you reported when I used the original 13 1/4X17 aluminum prop. I put on a 13 3/8X15 stainless steel and am much more satisfied with it than the 17 pitch. Ended up pulling the RPMs up about 300 RPM or so and kept the same speed which is no issue with me. What I really noticed is the decrease in torque on the handle when pushing the boat up on plane. It's way easier with the 15 pitch prop. Wish I had done it earlier.

Paul

[dno]

I have a 2005 90 honda on a 17 foot crestliner (1300 pounds)and with the 13.25x17pitch I run 5400rpms. I went to a 13.5x15 and run 6000rpms with a full load(full fuel, 3 guys, 3 batteries etc.).

[Manxfishing]

I run a 03 185 TP with a Yamaha 90

The Honda has a 2.33 gear ratio and the Yamaha has a 2.31 so we should be very close

I used to run a Yamaha black steel 13 X 17 and it would run 34 mph @ 6000
(It has almost no cup on the prop)
Now days I'm running a Mercury Vengeance (SS) 13 X 16 and it will go 36 mph @ 5900

The 17 pitch is just to much prop in a SS
I'd say go down to a 16 or better yet a 15 pitch in a SS prop