If you touch the throttle while starting, the throttle position sensor alters the ignition timing. This can cause a backfire and, worst of all, the dreaded AIRBOX KA-BLOOEY.
Steelheart- '03 Speedmaster Black/Yellow
The Hayabusa Killa
16" Shorties/140 mains/Airbox drilled
Procom CDI
"There is no cure for Celibacy. But we can treat the symptoms."