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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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