2014 Suzuki 60AV prop selection

[Pappy24]

I have a Suzuki 60 AV on a 18 foot StarCraft Fishing pontoon. WOT is 4900 RPM. 3 people and regular gear at 4450 RPM is 13.5 MPH trimmed. This is my top speed. Currently running a 3 blade 14 X 9 dealer installed. Drove a buddies pontoon this weekend ,same size vessel, He had a 40 hp two stroke that flew close to 27 mph same load but pushing 5700 RPM's. Need some help getting more speed from my Suzuki. Thanks in advance.

 

[NYBo]

Is this a new problem? You are apparently running well below optimum RPMs. What does Suzuki list as the correct range? Is the motor running properly and is the throttle working correctly to provide true wide open throttle?

I find it very hard to believe your buddy is getting 27 MPH out of his 40 HP motor.

 

[ahicks]

First, 40hp pontoons won't crack 20mph, period. If you double that power, you might be close.

Second, you're pretty sure you have a 14x9 on your boat? Diameter sounds pretty big for a 60. 12 or 13" would be more normal. Whatever, you're going to need a smaller prop to let the engine turn up some rpms that are closer to max rated to get better speed out of it.