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 Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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