Just bought my first bike. it is a 01 426. The guy I got it from didn't know how many hours on it and if the piston/valves had anything done to them. The bike is in great shape on the outside. Before I start riding, what maintenance should I have performed? I need a new rear tire, what size does it take. and what make model do u recommend? I am new to the dirt bike thing but an avid car mechanic. where is a good place to get an assembly manual as well as buy parts?