Anyone do a pulley swap on a vari drive?

Hi. I have a MTD with the infamous vari-drive, but unless I find a 5 speed locally I'll probably just play with what I have. It is a father son project so I'm not looking to make it go too fast. I was curious if anyone has tried a pulley swap on a vari-drive and how well it worked out? Goal is 20mph, but honestly if I can get 15 out of it I would be happy for now. Before anyone goes no about safety, yes it is getting a rear disc and direct steering before attempting to make it faster. Thanks!

Not personally.. but ive seen it done. As long as yoy use the right pulleys for the belts it should work fine. To get 20mph id use 5inch in the front and 4inch in the back.

Thanks! I'll give it a shot if I don't find a good local 5 spd for a good price in the next couple weeks. I know this is going to be hard on the belts, but I imagine that if we just cruise this thing around on flat ground we might be ok.