Cant get the rpms to move @ wot!

tritoon 150

Cadet
Joined
Jul 7, 2011
Messages
6
HI guys new to this site. I have a 20 ft tritoon with lifting strakes and a 1989 merc 150 on it. I can not seem to get enough rpms out of the motor. I had a 14.5 by 17p on it, ran 43 mph @ 4800. Had the prop re pitched to 15p. I now run 38 mph @ 4800. Looking for 5600 I believe. These are aluminum props. Want to buy a SS prop when figured out. Cant seem to gain rpms. The motor is set back 11 inches and the center-line of the prop shaft is 4.25" below bot. of center toon. I am thinking carb problems maybe ?.This was in the shop recently and carbs checked fine, they adjusted but didn't take apart. Any thoughts would be appreciated. What prop would you suggest? THANKS JEFF
 
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