1985 Starcraft porpoising issue. Prop??

D

derek4325

Petty Officer 2nd Class
Joined
Mar 7, 2015
Messages
167
Stinnett21 said:
I know its an I/O, i.e. not as much weight on the transom as an outboard, but old aluminum hulls are known to "hook". This is where there will be a bend in the hull at the back downward usually due to not being properly supported by the trailer at the stern. Put a long straight edge against the bottom and check. Doesn't take much to make a difference.
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I'll look into that. I don't feel that's the issue since over half the engine is supported by the trailer but I'll rule out what I can. It's in the water now I'll check it next time it's out
 
jimmbo

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
13,746
What year is the Boat and Motor?
Regarding the differing WOT Ranges, Merc might have made some changes to the Motor, and needed the Higher Rpm to get the Rated HP.
 
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