IF.. that is the only piston that shows "symptoms" I would remove the carb. / Intake and from that end remove the end-cap of that particular piston/rod.
and see ???
Yes, it can turn over with seized rings & if it spins with the plugs out.....seems to me that you have a weak starter and/or bad wiring/connections/ground
Jerry, I think Dunbar meant a 3-way/pole switch set-up like in a house
A regular on/off/on spring loaded switch does the job, the switch controls the relays
On a 4-stroke when the valves timing is off, yeah maybe
On a 2-stroke?? I can only see this happening if the (intake reeds are seized solid/melted-on???) but then it would be in a scenario as your post #5
