I received a bike recently from my step dad. He had it in storage and it did not start at first. I realized it was not getting gas and found the gas valve to be clogged. Once I cleaned it out the bike fired up after about 20 kicks. It is running rather well now, but needs to be tuned. I would like to be able to find information on this bike such as spark plug gap, oil specs, etc. My problem is I'm not exactly sure what it is. My best guess is a '73 Yamaha DT3. I found this serial on the frame and engine - DT1F-136546. I want to buy a manual to find the specs for this bike or something I just would like to make sure it is the right manual first. I am a DIY car mechanic, but bikes are new for me. Any help would be appreciated....