That type of valve problem is caused by the type of engine oil being used. Those engines are very prone to carbon buildup on the exhaust valve stems. When put under a heavy load the valve temperature will increase causing the valve stems to expand. The carbon on the stems causes the valve to hang open a little and the combination of the valve head temperature and the oxygen in the fuel mixture leaking out past the valve on the compression stroke has the same affect as cutting the valve with a torch. The solution is to use the later style valve stem seals and, most important, to use a low ash oil.
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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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