Just purchased a 1999 RMK 700 Indy. It starts fine when cold with 2 primer pumps. It will run for about 15-20 minutes on the trail. Then, it just dies. Feels like it loses spark. At that point, it is flooded. After about 20 minutes and clean plugs, it will fire agian. It then repeats the shutdown. Anybody know what is going on with it?