I agree with others in saying that the kart looks very nice and I feel it would be perfectly suitable as is, with a regearing at most. Mufflers can be made fairly easily.
Are you concerned about the safety of gasoline vs electric?
More importantly than anything else: Helmet, supervision, and responsibility on the kid's part. If a kart is treated with the respect that any 100+ lbs worth of steel that gets you moving faster than you can run deserves, the engine shouldn't matter for general safety.
Are you concerned about the safety of gasoline vs electric?
More importantly than anything else: Helmet, supervision, and responsibility on the kid's part. If a kart is treated with the respect that any 100+ lbs worth of steel that gets you moving faster than you can run deserves, the engine shouldn't matter for general safety.