Donna, the reason for not rolling the throttle during startup is because of the ignition system on the bike. The igniter unit evaluates the signals received from the pick-up coil, which informs it of the engine speed and piston position. There is a throttle position sensor on the right had side of the carburettors, which informs the igniter of that position. From these signals, the igniter unit calculates the correct ignition timing and supplies the required charging voltage to the high tension coil. The parameters within the igniter are pre-progammed. Because of this if the thottle is not in the idle position (not moved) when starting, it can cause backfiring. I have found that in normal weather conditions, it is best to try starting by disengaging the clutch, and hitting the starter. If it does not start right away and during cold weather pull out the choke, disengaging the clutch, and hitting the starter. Sometimes when it is very cold out in the 20s or teens I have had to hit the starter a couple of times. Sometimes I will roll the throttle a couple of times before I hit the starter. It is best never to roll the throttle during starting.
Dave
