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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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