Welcome to the forum. We might have a member that's near enough to offer some assistance but until we determine that let me assure you we'll do everything we can to get your boy on the road.
We have an extensive knowledge base here most of which can be had by using our 'search' feature. Members are also usually here and willing to offer assistance. However we need some specifics before offering help. Can you tell us a little about the engine? Is it a Chinese 2 stroke engine? I realize that you might not have the answer handy but if you can find out for us we can begin to offer some troubleshooting ideas.
In the event that the engine is the typical, and very common 2 stroke, here is a quick guide to help pinpoint where the problem might be > http://motorbicycling.com/showthread.php?t=35090
Hopefully this will help but stay tuned for more input from our members.