No
Medium cage.
I work at a Go Kart Repair Shop and the current age limit to drive a go kart around a neighborhood area or similar scenario is 13 years of age. As long as you can drive the vehicle safely, you are good to drive a go kart. I hope this helped you in your needs.
The clicking sound may be due to misalignment of the derailleur or a bent derailleur hanger. The rubbing on the cogs can be caused by the chain being misaligned or the derailleur being out of adjustment. Try adjusting the derailleur limit screws and check for any bent components before taking it to a bike shop for further inspection.
At a go kart place
Its 1100cc on a go kart :D
Where can I driver my go kart
There really isn't much to fix on a derailleur cage. The guide and tension pulleys can be replaced, screws can be tightened, but that's about it. Straightening a bent cage is possible, but it's really hard to get the alignment back close enough for the derailleur to work properly. I'd buy a low-end replacement rather than attempting something like that.
This is a shop-n-go kart.
A box car or a go-kart is simple to make with some wood and four small wheels. If you want a motorized go-kart then it's more complicated but you can probably also make one if you are prepared to work on it. See the attached link for a basic go-kart.
go to a go kart store or ebay!
The Mini Beast.