I put a Yamaha Raptor frame around a 1000cc Engine...er
a Engine in my Raptor.. Not mine but I love the creativity! I also would like to drive it...

http://worcester.craigslist.org/rvs/3231663935.html

Thought moving the output shaft (center of the sprocket) that far away from the swing arm pivot point created all kinds of suspension problems like Engine torque messing with the traction and suspension performance.

Engine mounts look weak not well designed?

No air filters no place to install them this intended to be a street machine only?

Looks like a lot of fun. I put a 1000 ninja Engine in a warrior years ago. It loved the spiked tires and big frozen lakes. Never saw atv tires grow so much.