aallhh43 wrote:
Installed new prop at end of last season. Noticed that now my RPM (Mercury tachometer)readings are off and that to proceed at normal top speed, my tachometer is reading above 7k. RPM's are off by about 2K RPMs. Any ideas as to cause, is it the new prop that is a problem? I purchased the recommended "Black Max". I do not want to return to repair shop and simply open my wallet. Thank you
Yep sounds like the new prop has a lower pitch than the old one. Running an under pitched prop will cause over revving and engine damage. Proper pitch will allow W.O.T. to fall within the recommended RPM range, as listed by the manufacturer.