ContinuousWave   Whaler   Moderated Discussion Areas   ContinuousWave: Whaler Performance   13-footer, Mercury 25-HP Bigfoot    search | FAQ | profile | register | author help

Author	Topic:   13-footer, Mercury 25-HP Bigfoot
typhillips	posted 09-24-2010 02:20 PM ET (US)         I have a 1966 13-foot Boston Whaler boat with a 2005 Mercury 25-HP Bigfoot. The maximum engine speed should be between 5,500 and 6,000-RPM. I am only getting 4,500-RPM. Throttle seems to be working properly. The current prop is an 11-pitch. A portable tachometer showed that mine is reading about 400-RPM low--not sure if tachometer is set up correctly. An 8-pitch propeller was tried and there was no change in RPM, just reduced top speed. This 8-pitch prop is about 2-inch bigger in diameter. Maybe too drastic a change? Any thoughts? Help would be greatly appreciated.
Tohsgib	posted 09-25-2010 12:33 PM ET (US)             Pole is set wrong on tach.

Hop to: ContinuousWave: The Whaler GAM or General AreaContinuousWave: Whaler MarketplaceContinuousWave: Whaler Repairs/ModsContinuousWave: Whaler PerformanceContinuousWave: Cetacea CommentsContinuousWave: Small Boat ElectricalContinuousWave: Trips and RendezvousContinuousWave: Post-Classic Whalers