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 - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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