Delaminating Ignition Coils?

Adam Blickhahn /
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My friend has had 3 internal ignition coils delaminate on the edge, thinking the flywheel was rubbing, I let him use one of mine, and the same thing happened. These have all been used, with unknown mileage. He's about to buy a new coil off Treats, but I'm wondering if it won't just happen again. Could heat be doing this?

This is on a Dr kitted Vespa engine.

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