The forestay and shrouds should be cable. If the cables and shackles are in good condition and tensioned properly it is a pretty standard setup. How many thousands of 420s are there out there with the same configuration?
Might get a quicker answer for something that specific on the Com-pac Owners association: https://cpyoa.com/forum/index.php
It’s likely the points needing to be cleaned if it has them, a poor grounding wire, or the coil needs to be replaced.
This is guessing that the flywheel magnets still attract a wrench?
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