HA! Blink has it covered.
Chains: They break, keep at least one new spare.
Sprockets: They wear out, old chains will chew them up, and new ones will too if you don’t keep an eye on the chain tension.
Battery: One fully charged or ‘new’ spare.
Throttle cable: Cheap but important.
Brake cleaner-
WD40 (use as a cleaner, not as a lube)
Credit Card–get an extra one.
Talk to the shockwave guys, too. Pay one of them to go to the track with you.