jaxam2 wrote:
I have a Yamaha 115hp and would like to up the power output to 130hp
or even 140hp. The specs for these motors is all the same so it must
be timing and /or jets in carbies.

.....and possibly heads and piston shape and compression ratio as well.

Billgran wrote:
@hotmail.
Contact Marine Performance, Inc. Nixa, MO (417)725-5746, also known as
Hydrotec marine.


Del Cecchi wrote:
I thought modifying outboard motors for more power for non-racing use is
now prohibited, at least as of some model year like 2000. Is that not
true?

Prohibited? In the USof A??? (sounds unconstitutional to me)
BTW, I have the opposite situation. A 200hp Mariner that I'd like to
trade off some horsepower for better fuel consumption.

Rick