I was on the highway and downshifted from 6th to 5th (going about 50-60) and the bike kind of died on me but stated back up just like Turbo said. but then i downshifted from 5th to 3rd on the exit ramp and i guess i held the cluth too long (but i've done that before and the engine never shut off) and when i let it go the back tire locked up going about 30-35mph and the engine didnt start again. I know you can start it if the battery is dead in 2nd gear but you need a lot of speed to do it in 1st or 3rd.
From the sound of it, you didn't "hold the clutch too long" and kill the bike. There were a few things that all happened within a short span and caused this.
1. Idle was too low which resulted in the bike dying.
2. You didn't realize it had died because you coasted with the clutch lever pulled. I'm assuming you were downshifting and using engine braking at the time this all took place.
3. When you released the clutch lever, the engine grabbed (which felt like a lock-up) and you weren't expecting it, resulting in dumping the Busa.
The difference between push starting a bike and starting the bike at speed by popping the clutch is huge. Push starting you're under 25 miles an hour, you're expecting a little hesitation from the rear tire, and you're listening for the engine to growl to life.
In addition, you really don't want to pop the clutch at speed. You would either engage the clutch and try to restart the bike via the starter (preferred method), coast the bike to a safe stop, or coast the bike to a safe speed around 20mph and pop the clutch. Regardless, you'd want to pull over shortly thereafter and examine the bike, it's idle and etc to identify the "problem".
<!--EDIT|HT_USMC
Reason for Edit: None given...|1144698375 -->
