I believe those two motors are put in a class where they're pretty much
identical except for displacement. For my Yamaha, I've only changed plugs.
It doesn't need anymore than that.


"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.