Don't think you would be using it under full load for a extended period moving snow to have a red muffler.
Sounds like you have unburned fuel passing through the engine and igniting in the exhaust system. Could be ignition or a fuel problem. Won't do any good to guess.
What's the engine temperature running at? What kind of manifold, gas or distillate. If distillate or kerosene manifold how is the adjustment lever set?
Would immediately shut down engine when operating long enough to get a red muffler and check spark plugs color.
Check ignition for the correct time and that the distributor advance system is working.
After making sure the ignition system and spark plugs are good, exhaust is open and the engine gets to operating temperature. Turn the carburetor load screw in until the engine stumbles under load or when the throttle is opened fast.
If load screw turned in doesn't do the above, check the carburetor again. Also check for ice in the air cleaner.
Notice I failed to say to open the load screw back up after the screw in check.
This post was edited by D Slater at 03:07:03 01/06/14 2 times.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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