I always enjoy the exhaust flame shots
Interesting range of shutter speeds, 1/400 looks nice blur, 1/160 and 1/125 I can't see the spokes but has a nice sense of speed, and the last one at 1/500 looks like he was going faster - as again I can't see the wheel spokes.
I'm not a bike expert, what is the norm for photos like these?
I'm still trying various settings to get the "right" look, and not being used to cornering speeds (way different from 4 wheels) I'm not sure I've got it yet in mine.
Trends in car photos vary, but almost every on track shot I've seen in print has a blurred background and some extent of tyre blur.
I tend to try to shoot bikes the same, but unlike cars I tend to get a lot of shots where the wheel is so blurred that you can't see the spokes and the bike is held in the air by very high grade magic

Does that matter?