1973 20hp merc spark plug

[fishkilla22]

what is the correct spark plug for this outboard? i recently bought this outboard and it had the champion j6c in it but from what i know about older mercs they take champion L78V. so what is the correct plug?

 

[carholme]

Re: 1973 20hp merc spark plug

If you are sure it is a 1973, here is the parts list:

http://www.crowleymarine.com/mercury-outboard/464.cfm

See plugs item 36 under FLYWHEEL, IGNITION COIL, STATOR AND SWITCH BOX(GROUP NO. 14)

Gerry