Go kart shakes low speed?

[KyleW]

I have a go kart that I put a Predator 212cc engine on with a torque converter (Comet). Not sure how old the torque converter is, probably pretty old. The go kart is shaking at low speeds, but once you get going a little faster the shaking goes away.
Would this be related to the torque converter? Belt? Chain? New to go karts, so not real sure where to start. Thanks!

 

[JTSpeedDemon]

The torque converter is probably a bit out of alignment. Post lots of pics!
Otherwise, replace ALL old and worn out parts.

 

[Dingocat]

Could be tires. Have a similar thing that goes on on my dingo. The tires have slight flatspots and it shakes pretty good until like 30mph or so.

 

[KyleW]

Thanks!
Did some research last night and discovered the belt on the torque converter is far from the correct one. Looks like the previous owner put a belt from something else on it (rather than being flat with the ridges, it is cone shaped). Will pick up a new one and while I'm waiting for it check alignment and snap some pics.

 

[mckutzy]

Off hand... what is the gear ratio and rear tire size OD??....