why would you need twins, almost none of the sleds have twins on them anymore.
none of our motor kits use twins, we use singles on every mountain sled, better average power and not as altitude sensitive with single.
so we trade off couple peak hp for average hp.
I only mentioned twins because that was the most common package we saw. I had a 2006 REV 151" with a 900 Crankshop Billet Cylinder kit and Twin Pipe setup on it and it was an absolute monster. I would love to have that kind of power in a ski. The acceleration was incredible and max revs was 7850rpm.
I also had a 2006 Phazer with a Torbo'd 500cc 4-stroke that made pretty decent power but the weight killed it. The turbo brought that 500cc engine up to 140HP but the REV had the 2-stroke 900cc and was 100lbs lighter still with way more HP.
My Sleds is what first got me into building up my ski engines. I'd ride all winter and get used to the power and acceleration and then come spring it was a total disappointment to jump on a jetski, pull the trigger and barely go anywhere.
I always asked why you couldn't get a watercraft engine to perform like a Snowmobile engine. I was so impressed with my Skidoo 800 compared to my Seadoo 951. I understand the physics are completely different between the two and the jet pump robs a ton of power, (130hp engine output nets 80hp out the pump) but the skidoo 800cc is rated at 150 hp while the Seadoo 951cc was only 130hp? :dunno: