15hp suzuki rough running at high rpm

woodsailboat

Petty Officer 2nd Class
Joined
Feb 27, 2012
Messages
108
A friend of mine has an early 2000s 15hp 4 stroke suzuki that runs pretty rough when it's on plane and the water coming out of the telltale is almost boiling hot. The motor is definitely not enough power for the boat it's on but I can't imagine that would have anything to do with it acting like it is, the water pressure is great and the impeller is new but it stays hot at all RPMs. Please help
 

99yam40

Fleet Admiral
Joined
Sep 7, 2008
Messages
7,596
Re: 15hp suzuki rough running at high rpm

have you though about the thermostat?
But pushing a motor too hard and not propping it correctly is bad
 

woodsailboat

Petty Officer 2nd Class
Joined
Feb 27, 2012
Messages
108
Re: 15hp suzuki rough running at high rpm

The boat it's on is a 14 foot fiberglass skiff but it's pretty heavy so I guess could stress it out but would it be enough to make the water near boiling.
 
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