Before Posting, Please Read Our Posting Guidelines Below.
1. Use the full 4 digit year for everything you are asking your question about. Example: 1962, 1988, 2000, 2011 2. Include the correct name of your Whaler model. Example: Montauk 17, Montauk 170, Outrage 26, Outrage 260 3. Include the length when necessary. Example: 16, 17, 18, 20, 22 4. Do not post your email address anywhere on this site as it is already in your user profile.
Hi all,
I have a 1989 super sport 13' whaler with a new Merc 9.9hp pro kicker engine on her with a 4 blade prop. When at 3/4 throttle all seems fine. Anything more than that the engine rpms rev higher, but i do not get anymore speed out of her. seems like there is cavitation possibly. According to articles i have read, the motor is the correct length, cavitation plate just below the bottom of transom. Should i try a different propeller? Thank you in advance.
Brian
simpsonbrian1,
I don't want to ask stupid questions but here it goes:
1) Is the tilt lever on your motor locked in the down position. The reason I ask is that I had a similar situation and discovered the trim on the motor was not locked down so at higher RPM, the outboard was slightly, "floating higher, thus making the prop cavitate.
2) What advantage is using the kicker at such high throttle? I find it hard to believe that it takes that much throttle to get to trolling speed.
If that is your main engine, it is too small for that hull. You are maxing out at hull speed. If it is your "kicker", its too big for the hull. A 6 HP will still max out at hull speed without the overkill.
