OK, the bike starts right up runs great. After about 5-10 min. runs bad like its on 1 cylinder. After running bad for about 10 min. Bang, bike takes off and runs great for the rest of the ride. Carbs have been redone to like new, sprayed carb cleaner looking for a leak while running bad.nothing. Any help?

 

Check your battery connections, your plug wires and your coils.