My 12 ft aluminum boat has a 9.9hp motor bored out to a 15hp. Every time we've been out on the boat lately it seems to run fine until we try to get it goin full throttle it bogs down to where it is hardly moving.
We thought it was the fuel filter. But now im thinkin we have too much weight in the boat. Maybe it's not enough power to push 2 full grown men weighing around 200 each. But i really have no clue if thats it.
Have you tried adjusting the fuel/air mixture. Older motors have a manual adjustment.
that motor should have no problem pushing a 12 ft boat with 2 people in it, whether its 9.9 hp or 15hp.
My Dad has a 12ft livingstion boat with a 15 hp motor. With 3 people in it we were able to get up on a plane and do about 28 mph (according to a handheld GPS).
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