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Hello,
I am back to the board again! after cleaning the carb and put it back. I could start it 2 times. It ran ok since I by passed the kill switch. I could not stop it by the choke. I had to unplug the spark plug cable of the first cylinder to kill the engine while the choke still engaged. The engine was not stopped right away. It was still ran for a couple seconds. I started it again and un-pluged the second cylinder spark plug. It stopped right away. Next day, I could not get it run. Both cylinder still had spark. Pull many, many times until I broke the recoil spring so I could not start it. The recoil spring broke at the end so I could be able to rivet it back but have not done yet. Try to figure out how to adjust it.