Yamaha F40 propeller
Hi, i am beginner in RIB boats and i need some help.
I have RIB Bombard SB420. Now i have secondhand engine Yamaha F40 (2008) with prop 11 3/8 x 12.
i would like to find solution for my following problems:
- max RPM is only 4800-4900
- max speed is "only" 25 mph (3000 RPM - 12,5 mph)
speed by GPS on my iPhone
I don't know on which boat was engine use before my RIB.
I think that i have wrong propeller for my Bombard ....