You have fuel,air,gas,oil and spark,what else do you need to have to make and engine run?
Coolant is my answer. Want last long without it :)
Ahh but see you didn't say how long.
Lol that depends on weight of the foot :)
Maybe it was before your time but there was a few of the open air engines that didn't use coolant, they only fired the plug when the flywheel speed dropped to a certain speed.
All good answer,s,and yes i forgot to add coolant to the list,ray that is a good answer,but i am looking for what make,s them go together.