a spare exhauset matte for when you notice a drop off in engine performance. If it’s a new exhaust, you’ll have to drill out the rivets to remove the stinger and then replace them with nuts and bolts. I’d have a spare set of tie-rods and king pins plus a steering shaft. Maybe a spare nose if the group your son is racing in is very aggressive. You shouldn’t need a spare set of brake pads if the ones in the kart are good, but keep an eye on the for wear. And maybe a couple of extra nut and bolt for the floor pan.
LAD Specialties customer / tony kart / rotax / kt100