On a sled that old when they came from the factory they recommended 20:1 gas/oil. That is a bit thick for the modern oils that are out there. Unless you plan on racing it you can get away with 40:1 just fine.
Anymore with the modern oils you can get away with a lot less oil than you used to. The last motocross bike I had was a Yamaha YZ250 and I ran Belray H1R synthetic at 100:1 and never had one burn down.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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