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Hi Ron. My name is Tan.
Have you checked that you have spark on all 3 cylinders when you first start the motor?
The engione needs fuel, compression and spark to run correctly. We can eliminate the fuel system as they have been gone through. We can eliminate the compression as the engine runs good once it does run correctly.
Leaving spark as the only thing that hasn't been checked or eliminated as the cause of the issue.
The spark must jump a 7/16" gap on a spark gap tester on all cylinders. This is the test we need to perform.
It is hard to tell if you have a misfire on a 2 stroke motor and it will run on 2 cylinders. It won't have any power on 2 cylinders till the 3rd cylinder kicks in. Which could be a spark issue.
Does this make sense?