Ok I have a sweet go-kart for sale. Its an older Manco model, but has a Briggs V-Twin 16hp, slightly modded to about 20hp. Has the comet clutch. Tires are 22" ATV tires. Has electric start. Frame is decent, has a poorly done homebrew cage on it. Brakes could be done better. But its a good start. Motor runs awesome. Selling for only $400 firm. Motor alone is worth that. This go kart will do donuts all day long with me in it, and I am 230 lbs.
Forgot about the $50 all star racing control pannel I added. Its included as well. Has an accessory switch if you want to add lights.
I brushed the snow off of it (usually stored in the garage, have an engine in the way now though) and it fired right up. Gotta love electric start.
Here's the pics: