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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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