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 - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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