That's certainly not piston ring related. You could have stuck rings that are limiting compression, but the spark is something else. Do you have a test light? If so, you could check at the two primary wires of the coil to see if the coil is receiving power. If it is not, move backwards towards the stator. If it is, move forwards towards the coil, coil wire or boot.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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