When first starting, it runs at a reduced speed (choke open), for a few minute and then quits altogether. Is this the result of bad fuel or the wrong mixture, or something completely different ? Wade
Replace fuel with clean fuel with proper oil mix. Also the carb. could need cleaning or diaphragm could need replaced. One thing you would need to check that will not cost much but may save you a lot of trouble is the muffler. Check the muffler for obstructions and remove the muffler and check the exhaust port for carbon buildup.
Two cycle engines have a habit of vibrating enough to cause bolts to come loose. You could have a leaky head gasket or crank cover gasket and still be getting excellent compression at the spark plug. If there are leaks then the piston won't be able to create enough suction on the up stroke to pull the gas/oil mixture from the carb at low rpms
I had the same problem with my leaf blower.I disassembled to find the flywheel key was sheared.I instslled a new key and reassembled. It ran fine after that.
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