new to forum and prop question

[vaughn4380]

Hello,

I just bought a 2004 120 Triumph with the 25 HP Yamaha. I love the boat and am looking forward to many years of use out of it. My question is, what prop size (and pitch) did your boats come with from the factory? And what prop size and pitch are you using now? The previous owner replaced my prop with a 9 7/8 x 9 and it seems to have a very low top end. I am thinking of replacing it with a 9 7/8 x 11 to increase the top end but was wondering what the rest of you use. Thanks and great forum!

[Jeff]

Hi,
I had the same prop on my 2006 120 Triumph 25 HP Yamaha and my top end was like yours - slow! I replaced it with a Michigan Wheel Vortec Aluminum 10 X 12. I can now go 23-25 MPH versus 15-17 MPH with the 9 7/8 X 9. I also put a Hydrofoil on it to keep the bow down and get on plane quicker. All is well.
Jeff

[Bob1008]

Jeff,
What brand of Hydrofoil did you use and was it really a noticeable difference? My bow is like straight up in the air.

[Jeff]

Bob,
The Stingray Speed Xp Hydrofoil Stabilizer Jr. in Yamaha/Grey @ iboats.com for $49.00. There was a noticeable difference with it on, especially with the larger prop. The hydrofoil helped the boat get on plane faster, therefore bringing the bow down sooner. During initial acceleration the bow still goes straight up in the air, but I work the trim and the speed to get the boat on plane.
Jeff