It probably has to do with the fact that you're no longer firing on that cylinder... which means only one cylinder is firing, and the other is just dead-weight, which means left cylinder is counteracting right cylinder, which means it's spins slower.... It should sound a lot different when you do that. It should sound sick, like it's got a cough...
doubtful... Timing shouldn't do this, a messed cylinder/piston shouldn't do this... It has to be fuel/carb... IE - too much fuel getting through the carb... I still think it's the idle knob... but a video would be good.
...maybe a stuck "choke" mechanism (fuel enrichener to appease RedRider). The lever may slide back and forth but does the linkage move spooph is right about why it goes away w/ one plug removed (dead mass, only one power stroke, less enertia, etc.) It definitely sounds like a carb issue/ air-fuel ratio issue.
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