Hello bestseller
Okay, the three causes could be:
- bent crankshaft
- out of true flywheel
- bent alloy stator plate
That the flywheel only grinds once in 360 degrees suggests
to me either the c/shaft or the flywheel. Most likely cause,
an out-of-true flywheel (rather than c/shaft).
Any help or input from members most welcome.
Hope this helps.
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Jack