============================Watercooled, 4 sparkplug, 1 piece head narrows it down to a 1981 or 1982 engine used in the Kawasaki LTD snowmobile. (2 years only)
Fairly high strung motor - 76hp @8200 rpm Using dual tuned exhausts.
It's claim to fame was the fact it had 8 transfer ports to move a lot of Air required for that [email protected] high RPMs
For aviation use the Dyno graph shows around 45-50 hp in the 6000-6500 rpm range.
The Shop manual for your engine has about anything you need to keep it running.
If it still has the original Keihn Butterfly carbs they are very different as far how they are tuned/jetted etc. compared to Bing or Mikuni slide carbs. The shop book has the info on what to do.
BTW - from what I can tell it has a fairly high compression ratio - 12:1
Even though the manual says minimum 89 octane I'd run good 93 pump gas or better.
View attachment 118652View attachment 118653
Yes, [email protected] Thats a nice manual! Good find! That's WHY you wouldn't want to use this Sled Pipe Designed for 8200rpm on any Plane. (68mm x 60mm) 435.9cc/76hp= 5.735cc to make 1hp! 435.9cc/78hp= 5.588cc to make 1hp!
As the 440 Kawasaki Dyno Sheet I posted above shows, making Max [email protected], what the 618UL was turned at, also making [email protected] is more inline with Airplane use. 435.9cc/63hp= 6.919cc to make 1hp! 435.9cc/61hp= 7.145cc to make 1hp!
The 7cc to make 1hp Rule of thumb at 6500rpm is good for making hp for Airplanes! 435.9cc/7cc= [email protected] As the Dyno Sheet above shows, theirs made [email protected]
Yes, probably 12.0-12.5cr. The manual you Posted is very Good, gives Port Sizes, and Head cc. I agree 93+ Octane.
The only issue I see with it is finding those Pistons with the L Shaped Rings. I have walked many a Sled Swap meet and Sled Junk Yards and you don't see many of these. One thing good about Kawasaki's is they used a lot Parts the same in the Sleds and on 440 Jet Skies.
I would change out the Keihn Butterfly Carbs for Mikuni Flat Side Carbs myself. I just bought a New 38mm off eBay for $81. 34mm go for $40.