Quick question- my father-in-law replaced his coil/points/plugs last Fall when he couldn"t get spark in his 450. The old coil had a beat-to-H metal case, and he replaced it with a modern plastic/bakelite one.

Has run great since, until it suddenly died yesterday, after running too hot to touch. I have no idea, nor does he, if either his old or his new coil had a resistor in it, but sounds like it needs one.

He got another new one, and it started right up again, but also gets hot. Before I go take a look-see for myself, would/should his 450 have a separate ballast resistor?
 
A coil running too hot to touch says you've got 6 volt coil being fed 12 volts!

Wiring a ballast resistor in series between the ignition switch and the coil primary will solve the problem. Or replace the coil with a 12 volt coil (it will be marked "no external ballast resistor required" or similar....)

Incidentally a properly operating coil will become only a bit warmer than the metal distributor housing. Ie. it will be cooler than nearby engine surfaces.
 

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