On Jul 4, 8:59 am, Tim wrote:
On Jul 4, 8:20 am, wrote:

Hey guys, quick question. I have a Rotax 720 in my sea doo
sportster. I badly need more power. What is the best way to get
more power out of that engine? I am thinking of boring it out .5 and
cutting the head. But I dont know if that would mess up the
carb( same amount of fuel,but bigger firing chamber). Any idea's?

Thanks!

Justin Van Dyken

A different exhaust (expansion chamber) would help a lot. rememebring
that from my old two strike motorcycle days.

Here's a quick search. that 720 is pretty beefy, and mod's are
relitivly cheap ,and easy:

http://www.rossiereng.com/tech_pwc4.html

Justin Van Dyken wrote:

Tim,

Very helpful website!! I had been thinking about cutting the head as
well but I was not sure what was a safey level to raise the
compression too. This site lays it all out! Thank you

Justin Van Dyken