Just got my grandson a go cart. Is complete less wheels and engine. Engine is not a problem, but where would I pick up secondhand wheels. On the front axle there is two stubs with large nuts on the end. A large dia. shaft is on the rear and holds the chain drive. Anyone got any bits especially wheels. The cart is like new fibre glass sides etc. Never worked on karts before.

I don't know anything about carts and I have no spare parts, but whilst doing a KC stuff I've noticed this online shop that could end up being useful for you!

http://www.zoomkarts.com/CustomPage.asp?CustomPageID=12

Good bits here too
http://www.karting.co.uk/MP/

Have you tried ebay? Often kart bits cheap on there