I have had a sticking exhaust valve that will make them pop and then coast to a stop. The "new" gas will varnish pretty fast in hot weather. I have had to take the valves out and use a wire brush wheel on them to get the hard varnish off.
Easy way to find out if it is fuel or a sticking valve. Remove the air filter/cleaner. Have a can of brake clean or starting fluid handy. Crank the engine over and spray the fluid into the carb. If it runs then you have a fuel issue. If it does not then you have an exhaust valve sticking. It will return slow enough to pop the next time you crank it but not fast enough to run.
I have had several each year have sticking valves.
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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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