Newbie here, need help...

[i8abug]

My name is Dave, and I have gained much wisdom from this forum, that I decided to join. Unfortunately, I doubt that I will be able to contribute, unless you need info about how not to do something right, ha ha.

Anyway, here's my question:

I have a 1980 Johnson Seahorse, 9.9 hp outboard. I've read so much about how to convert my motor to a 15 hp by changing out the carburator, but understand (or have come to believe) that I may only have to remove a "restrictor plate", and/or change out a jet - depending on the particular year or model....?

I'm so confused....

Does anyone here know exactly, or know of a good reliable link that can clarify this? I am aware of the exhaust tube difference too.

Any help would be greatly appreciated.

 

[kbait]

Replace w/15hp carb ‘74-‘87. There are other minor differences, but you will boost power significantly, and it will run fine if it’s a good runner now.

 

[Rick.]

Lots of great info. On your engine at leeroysramblings.com It's worth your while to have a look. Best of luck. Rick.