What prop to buy for 25 hp yamaha 4 stroke?

[boughtaboat]

Want to purchase a new prop for my '98 25hp yamaha 4 stroke that is on a Lund 14' wide beam aluminum v-hull. When I look up the part it gives me numerous diameters and pitches to choose from and I have no idea what would be the correct selection. Will use the motor to troll some (also has electric trolling motor) but also need to make longish runs up and down the lake. Can someone recommend the correct diameter and pitch?

Can't find model and serial number tag on my motor. It has power tilt and trim and there is no tag on the motor mounting brackets. Any thoughts?

 

[rodbolt]

Re: What prop to buy for 25 hp yamaha 4 stroke?

only way is to try a prop but you MUST check the RPM at wide open throttle with the expected load.
thats the only way to select the correct prop.

 

[99yam40]

Re: What prop to buy for 25 hp yamaha 4 stroke?

Check out this site and see what they used on boats and loads similar to yours
http://www.yamaha-motor.com/outboard/products/perfbull.aspx?ls=outboard

 

[vote4me4pres]

Re: What prop to buy for 25 hp yamaha 4 stroke?

I have an F25 on a 15' aluminum v hull. Boat, motor, me, stuff about 900lbs. I use a 9.9 x 11 solas prop ~5800 rpm.