I just got this BMX Odyssey 403 50cc ATV brand new through a trade. After started in runs and preforms great for the kids. It even hauls my 250lbs around. Problem is getting it started. Seems to foul out with the choke, but will not start with out. It tries and dies, I clean the plug, repeat 10 times untill it runs on. The manual is usless to help tune it. Anyone have an idea where to start?