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I have bought a Norton atlas engine that's fitted with flat top pistons so is effectively a commando engine

I'm planning to use one of my spare k2f magnetos

I've made a test rig for my lathe so I can do some long term testing before fitting to the bike

I'm going to heat them whilst testing

I tested one a few days ago,I ran it for an hour with good sparks but when I introduced heat the sparks started to fail and eventually stopped

Once cool it was fine

I assume the condenser was breaking down with heat (or maybe the shellac on the windings ?)

I've ordered an "easy cap" conversion for it and I'd like to test it and the other mags before fitting to the bike

I've had the misery in the past of waiting for the mag to cool down on my A10 before I bought a re con mag