Just got a '81 CM400 with 17k miles on it. Changed plugs, oil and filter, air filter, new chain and sprockets, has brand new tires, checked brake pads and shoes, checked wheel bearings, greased swingarm, inside tank looks brand new. Bike starts, runs, and sounds perfect. Any suggestions on what else I should check ? I thought about cam chain tension, but it runs perfect with no noise so I am iffy on that. Would I be able to hear if valves need adjusting ? Thanks for any input I can get, this will be my daily driver to work and back and I want it dependable. Also to anyone with a CM400, I got my K&N air and oil filters at WalMart.com believe it or not, and they were cheap, less than 7 bucks for the oil filter.