Spare parts wise, I always care with me spare CDI, CoPs, rectifier,plugs, and it all fits under the seat.
Some things you might want to change out for better reliability is the rectifier to a mosfet one, CoPs conversation.
Write-ups
Kawasaki ZX Ignition Coil Pack modification.
Who wants to see a MOSFET R/R upgrade?
More ideas are located in my
blog
Other things maybe upgrade the headlight bulb, I've been running an LED now for several weeks now, and I'm happy with it.
YITAMOTOR H4 HB2 9003 COB LED Headlight Bulbs 4 Side COB Dual Beam High Low Led Headlamp Kit 120w 12000Lm 6K White
https://www.amazon.com/dp/B01GDTE6HE..._xg.9xb4J35RDE
Don't forget spare fuses.