I have a 9.9 Evinrude and all I did was put on different carb and intake and
got it to be a 15. I would guess your motor is the same. The displacement of
the 9.9 and 15 are the same. its the carb and intake that give you the extra
horses. And if you change the prop you could get a little more get up and
go.
"Dag Sunde" wrote in message
...
What parts do I need for tuning a Yamaha 9.9
up to 15 HP?

Someone have an overview over the different
year-models, and the different ways it was/is
done on each?

TIA...

--
Dag.