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Will a 4 blade help

greenbomb

Member
Have a 2003 40 hp 2stroke Johnson on a 20 foot pontoon Stock OMC 3 blade 12 3/8 X 13 . At 15mph 5000 rpm it vents . Have to back off throttle .
Do you think a 4 blade will work better and stop the ventilation Or maybe a 3 blade stainless?
I have a omc 15 pitch but it keeps it below 4500 at full throttle
Thanks in advance
Norm in Arkansas
 
Last edited:
boat is way too big for a 40hp... anyway . just look at the motor when running and see if the cavitation plate is just slightly above the water when full throttle or if its way out of the water.... probably find your motor is too high........... also check your hub is not spinning.. mark the outer hub and the inner hub with a bit of paint of similar. go for a run and then take prop off and re-check...
 

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