I just bought this quad for my boy on Friday it was running fine. I went to change the oil and the head was stripped so to see what I was doing I lifted the quad and stood it up on end (rear wheels) gas leaked out so I shot off the fuel and did what I had to to change the oil. Went to start it and the bike would idle but would bog down when gave it throttle. Changed plugs and it seemed to be fixed until today boy took it out and it bogged down again I put another plug in and no change. I am thinking when I tipped it back oil ran into the carb and is now gummed up.. Thoughts???