Custom/Hybrid Motor options for a custom hull??

[Bump]

Hey guys, Not new at all to skiis or forums, just this one. Been scanning here for a while now and have seen a few more extreme customs like I am building here rather than over at PWCToday.

Need some input on my thoughts.

I am debating what kind of motor I am going to run in the ski I am building this winter. I have been doing some research and thinking and have come up with questions.
I am looking to use a factory motor, not a custom built one like some of these ground up billet motors, 1. because I cant afford it, and 2 because of limited and expensive parts.

I am currently planning on using a big pin Kawasaki 750 motor. But was wondering about other options.
It is not uncommon for a mod snowmobile to be sporting a watercraft motor. (ie. 1160 polaris in a skidoo chassis) Can that theory be reversed? I have a Pro-X 440 that makes like 115hp... FROM A 440!! Also, this is a much higher revving motor. Peak about 8200rpm.
What is the peak rpm of a Kawi 750? and would it be a waste to go above this?
It would not be hard to come up with a 600cc motor from a wrecked sled for like $400 which would be making like 125hp. Where I will be spending like $5-600 on a kawi 750 making what, 75-80hp?

Has anyone attempted this or have more info on something of this nature?

 

[snowxr]

The polaris PWC based sled motors use the 1050 ans 1200 crank cases, but thats where the similarities end. They use sled cylinders, crank parts, as well as ignitions. The sleds motors are tuned for peak power where the sled's clutch shifts out. Low end torque is of less concern, since you don't lug the sled around at low rpm. PWC motors need a good deal of low end torque to turn the prop all the time.

The one exception to the sled motor not working argument is the polaris 700 and 800 motors. The cases are the same as the watercraft 700 and 777 motors, but everything else is different. The cylinder porting and crankshaft designs are purpose built, as well as the starting and electrical system. No easy swap exists on a budget.

That said, your 750 motor is a fairly inexpensive option. There are lots of performance parts available. If you could switch to a yamaha 701 motor you'll have even more options and good performance.