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Try leaving the chokey partially engaged. Operate it this way for a few minutes until the engine is thoroughly heated then move to the run position. If this does not work return it.
This sounds like worn main bearings beginning to seize. Worn bearings generate more heat which causes the metal bearings and their races to 'swell," thus getting tighter and generating more heat until the drag of the bearing friction is greater than the power of the motor. Eventually you can't restart it until the engine has fully cooled down.
Full choke until it tries to start, half choke until it does, and once it's running, open the choke fully and wait a few seconds for it to warm up before using it, as well as 15-20 seconds to let it cool down before shutting it off so as not to warp any metal parts of the engine
Suspect Ignition Coil is failing under heat.
To test this, take the unit outdoors and have a fire extinguisher handy. Start and allow unit to run until it shuts down. Then remove spark plug and test for spark by grounding the outer shell of the plug on the engine's metal surface.
BE SAFE! Keep your face away from the spark plug hole as you pull the rope to test for spark. Expelled fuel or vapors can ignite via the removed spark plug or any subsequent arc.
If no spark when hot, and good spark when cold, replace ignition coil.
Find your EXACT model number on your unit, then go HERE to lookup the part number of the coil. Call your local reputable repair shop and ask if they have it in stock or can order for you.
Hope this helps.
Reverse the line connections at the primer bulb. Look carefully, the long port has the line going to the tank, the short port on the bulb will connect with the fuel line to the carb.
Dump the fuel in the tank, get new gas and new oil and start over. Get a carbeurator cleaner additive for the gas as your carb. is dirty resulting in the sporatic operation.
A spray carb. cleaner that you squirt into the air intake by removing the air filter will also work for you. In fact, when you are getting the carb. cleaner get a new air cleaner and a new spark plug. get back and let me know how u make out.
How old is the trimmer? If still under warranty, Sears can fix this. If not, then my experience has been the problem is a bad coil. This is due to heat build up. When the coil gets hot, it shorts out.
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