Thread subject: Whaler Central - Boston Whaler Boat Information and Photos :: Prop advice for a 90 yamaha two stroke on an 1988 montauk

Posted by Phil T on 07/21/15 - 8:27 PM
#11
WhalerBob -

The general guidance on raising the engine is for each hole the motor is raised, one would gain 250-400 rpm.

I personally saw an increase of 224 rpm for each hole raised (motor was a Yamaha F1150