You just compared a Civic to a sled.
Also your sled is way over 450 lbs:
Dry weight is 495, add 10 gallons of gas you're almost at 600 lbs, then add your ride weight. You did get me on the track length though, it's been so long I can' remember all this shit.
And no, not all sleds are 2 cylinders. Don't forget about the newer Yamaha's. I still say no way 120 mph with a Crossfire. If it were a normal 121" track I'd say it's plausible but no way with a 136. I've ridden a Rev XP 800 Renegade and that could barely hit 100 and its rated at 165 HP.
Anyways, lets change the subject.