Three types of CD Ignition: Battery CD, Magneto CD, CD-3.
"Battery CD" was used on early 55-60hp. They have one coil on the amplifier bracket and spark plugs leads coming from under flywheel.
"Mag CD" 1972-77 had three coils, aluminum power pack with cover.
CD-3 1978 and later had three coils, epoxy coated power pack.
Lot's of 55-60's still running but they just don't perform like newer models. Before you "dink" with them you need someone familiar with the Hydro-Electric shift system. Too much information, sorry.
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