With my bike, I bought it with an AGM battery. It was a little hesitant to hot start, but never terrible. I found a slight bump of the throttle would help it. I did the pick-up mod, but I didn't notice much improvement with hot-starts. It did seem slightly more responsive off-idle. Many have suggested this mod advances the ignition, but no one has measured it to my knowledge.
I will agree with Spockster that this bike is very sensitive to voltage. I had a corroded stator connection such that my idle voltage was 11.5 V and higher rev voltage was 12.5 V.
Whenever I pulled away from a stop at a decent rate, it would mis-fire. Backing off the throttle fixed it. From 3k-7k it ran great at all throttle positions.
>7K it would mis-fire at heavy throttle again, and backing off it would run just fine up to 8.5k.
When I fixed the charging issues, all the mis-fires went away.
The point is, it takes a higher voltage to ignite a more full cylinder (more open throttle). At low RPM, there wasn't enough voltage to consistently spark when I had heavy throttle.
Mid RPM, the charging system provided just enough to work at all throttle positions.
At higher RPM, there were more sparks per second, putting more demand on the failing charging system. It was able to ignite the light throttle mixture, but not heavy throttle mixtures.
When starting, the battery voltage drops and it drops to be insufficient to spark.
Changing to the AGM battery reduces the voltage drop when starting.
Direct coil mod reduces the voltage drop between the battery and the coil.
(To check your voltage drop, it's best to check while running at high RPM when the load is greatest).
I'm not sure how the pick up mod would help with the hot-start issue.
I don't think the hot-start issues are related to this, but anecdotal evidence suggests that it helps.
Reducing plug gap, new plugs, or fine tipped plugs (iridium) should also reduce the required sparking voltage.
Spockster, I think I found out why the choke helps your bike!!!
The first chart shows that it requires more voltage to ignite a lean mixture vs a rich mixture!
The 2nd chart shows the issue I had (full throttle mis-firing), whereby a greater air charge requires more ignition voltage.