I bought a bike off a guy for my son's 15th birthday last week and he hasn't got to ride it for a total of an hour. It kept quitting on him, now won't run at all. He's so disappointed and I can't find anyone to look at it. The guy I bought it from is 100 miles away and ignoring me anyway but my husband has looked at it a little but doesn't know what to do with it, he said he thinks it's a problem with the carburetor.... I'm wondering if there's anyone in my area that knows how to work on these? I'm in Southern Indiana, close to Louisville.