1978 evinrude 9.9 15hp conversion

[deaconmoore]

i own a 1978 9.9 evinrude that runs great.i have just bought a wider 14ft boat.the 9.9 will push it but is a little slow.i have within my budget a notion of putting a 15hp carb.on the motor.the problem is that i have been told the conversion would not help much without changing the exhaust tube.

 

[JB]

Re: 1978 evinrude 9.9 15hp conversion

The least expensive and smartest way to get 15hp is to trade your engine for a 15, Deacon.<br /><br />The engines have the same displacement, so at any speed the torque is very close. The 15 will turn higher rpm, which is where it gets most of the 5hp.<br /><br />You would notice very little difference in real world performance.<br /><br />Welcome to iboats.

 

[knobby]

Re: 1978 evinrude 9.9 15hp conversion

http://www.pugetsoundanglers.org/Fishing Info/Johnson 9.9_15.htm