Lots of good suggestions here, As stated, if the muffler comes apart, there may be a spark arrestor screen inside that is stopped up, it can either be replaced, or heat it read hot with a torch and burn the residue off and brush it off. Or maybe a mud dauber has built in the muffler and it is just stopped up. I have had that happen. Another thought, I believe there is a gasket between the cylinder and the crankcase, it could be leaking air there, I have also seen that happen. Make sure that the nuts that hold the cylinder to the crankcase are tight. Worse scenario would be having to take the thing apart to visually check.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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