I recently had a misfiring issue, bike would be fine but after about 15 miles or so when it got hot it started to misfire, put it down to leads/caps/ coils breaking down but eventually misfired when idling so pulled off the leads one by one and when I took off no.1 - no difference so it was number 1 and was not coils or leads or caps as I switched them and it was the same. so looked at fuel and carbs, luckily can take bowl off the outside carbs so took off bowl, took out jets, nothing amiss at all, all clean and dandy but put it back together and has been perfect ever since! go figure....