I am not a small engine mechanic but have had to deal with these problems for a very long time on all my small 2 stroke engines.
Take out the spark plug, pour our the existing gas, take a bottle of seafoam, pull the cord until you see the piston drop and stop. Now pour in the seafoam, and leave it for a few hours. It has to sit so the cylinder stays upright.
Come back and dump out the seafoam from the cylinder and spray some 2 stroke oil in the cylinder and work the cylinder back and forth to lubricate the cylinder.
Put in fresh fuel premium fuel with good 2 stroke oil with a little dose of Seafoam, put in a new plug.
For some reason, 2 stroke engines tend to oil up on the crankcase if let to sit. The 2 stroke oil comes in under the piston from the crankcase which is how it lubricates the crank and piston. There are reed plates that move back and forth sealing the crank case depending on what position the piston is at.
The seafoam seems to break down all the heavy oil as well as clears out the varnish deposits from the engine side of the carburetor intake as well as in the crankcase area.
When the engine starts up, it will pour out tons of smoke which is good, once the smoke stops, the engine should run well.
Please make sure to dose the cylinder with oil and work it back and forth before re starting. You need to re lube or you will seize the piston!!!
Drewski
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