Motor back splash

[curtisn]

I just replaced my 40 HP Force with a 40 HP Evenrude E Tech. When I go over 3500 RPM I have water spilling back it to the well between the pontoons. Tried trim all the way down to up until the motor starts to cavities. Its mounted on a 15 foot pontoon boated rated for 40 HP.

 

[ahicks]

USUALLY when you get splash back like that, the motor is mounted too deep. Is this 15' toon set up for a 15" motor, or a 20"?

 

[909]

Make some shims

 

[ahicks]

Or a new taller transom?