re: Helmet Don't put a two-bit lid on a sawbuck head! There were two very good articles in Motorcyclist magazine about helmet design, DOT vs. SNELL, Euro standards and safety, all within the last year, or so. I have had an ARAI for years, and it is a very comfortable, high quality and high priced helemet. I also just purchased a DOT/SNELL certified KBC (Korean) TK-12 Fuel full face helmet on closeout at Cycle Gear for $59.99.
I won't want to ride in it all day, but for $60 I have a brand new helmet with a removable, washable interior lining, and a brand new faceshield. Replacement shields can cost $40...
re: Service before riding Don't risk your life on tires/tubes/valve stems that may be 25 years old. Find out how old the tires and tubes are: 5 years or so, no problem if they look to be in good shape and don't have obvious damage. If unsure, buy NEW and BE SURE.
Plugs, check the air filter, lube & adjust the chain, REPLACE THE BRAKE FLUID. Have someone who is more familiar with older motorcycles check it out before you risk your life & limb on a bike, especially if you are unfamiliar with motorcycles in general.
Lastly: take a Mortorcycle Safety Foundation beginning rider course.
Cheers!
p.s. Oh, yes! Oil? Delo 15W-40 will work fine. A gallon ought to last a summer or so. Have fun!