Way back, about 1966 I was working in a gas station, and the owner was also a Toro dealer. We used the gas "shovel" to clear snow from the lot. That was when I learned the valuable lesson that you always mix the gas and oil in a can; not the tank. I added gas, then oil, and started it up. It started quickly and ran well, the RPMs then kept on going up, and up, until the crank exited the bottom of the crankcase. ( I thought the crankcase was to "contain" the crank. It did not serve that function well---must have been a design fault......).
I was then assigned a manual snow shovel.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags