looking for feedback.. preddy 99cc, rackmount, with torque converter

rackmounting a pred and a cvt your looking at around #40 pounds of metal at the highest point it could possibly be on a bicycle.
Plus it would have to be mounted off center to the left side of the bicycle making the bicycle want to always lean to the left. Plus making the rack strong enough to hold the motor. then finding a place to mount a bigger gas tank and having it feed correctly as its a gravity feed so it has to be taller then what the carb on the motor is.

Inframe would be stronger and most of the needed frame is already made for you.
Making a motormount the includes a jackshaft takes care of the chain alighnment issue and if you want to you can mount a Disk brake rotor to the jacks shaft to have a disk brake rear wheel

50/50 chance it will work
but even on this bike it wants to lean to the left and its much lighter then a preddy with a cvt

my predator build is going to be in frame with the agk jackshaft tranny and maxtorque clutch, with a 44t rear sprocket. at 6000 rpm's i will have a speed of 51, but will more than likely cruise at less than 5000 rpm's for a cruising speed of 35 to 40. total cost im in for so far is less than 300 including the engine. just need a motor mount and thats it. unless the motor mount is ridiculously expensive, this bike will be built for way less than 400.

You should check out MaxPower's thread, he put a 99 FD over the front wheel! So yea, anything is possible.

http://motorbicycling.com/showthread.php?t=36967

Sure it'll handle differently, like yank warned, but you'll get used to it. It all depends if you have room in your frame for the beast or not eh.