Just bought one of these today. Checked it over then hit the trails. Ran great for about two or three hours. Got back to the garage amd shut it down. Noticed that there was fuel pouring out of the tube on the bottom of the carb. Found that it was only an.overflow. But now quad wont start. Took carb apart and checked to make sure the needle was still screwed in and it was. Cleaned out carb and put it back together. Quad started. Took it for a lap around the land. Came back and as i was coming to a stop it just shut off. Now it cranks but no fire. Please help.