a fuel filter is suggested.. does not come with one, the stock air filter is good in all but very very dusty conditions.. it has small surface area so fills up pretty fast. then u run into danger of sucking dirth between the rubber and filter element..
tools.. i suggest buying a set of screw drvers, good quality, keep them as part of your rc equipment so you know where they are, i suggest a set of jewlers screw drivers or the very small phillips incase you need to open up a servo, receiver to let water out..
it comes with hex keys, they are ok.. but i do suggest real ones
a glow plug socket t hangle or the like, this will allow for wheel removal also, and there is usually one position perfect for the flywheel nut.
a bottle of loctite.. BLUE, use it it is your friend..
a can of marvols mistery oil.. its the same thng as after run oil, and u can use it to oil the air filter even..
i suggest a bottle of white lightning, sold at most bike shops.. it is a wax lubrecant thats self lubricating, i use it on all th edog bone to cup areas and see a major drop in wear of the cups since i started using it.