I just purchased an old 1979 Yamaha enduro from a neighbor for $100. It had been sitting in a garage for 10 year, but the thing looks and runs great. The problem is that I don't know anything about this bike. I believe it's a DT 125F which is a 2-stroke enduro model. The only other 2-stroke I've ever owned was a YZ80. I always thought you had to mix the oil and gas on 2-stroke, but this bike as an oil reservoir and the neighbor said you only needed to add straight gas in the tank. Can this be true? Does anyone know anthing about the DT 125's? I'm not much of a mechanic! Any advice would be appreciated.