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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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