1969 Evinrude 40 HP Big Twin, Lark Service Repair Manual P/N 4596, Page 34Get this manual

1969 Evinrude 40 HP Big Twin, Lark Service Repair Manual P/N 4596, Page 34

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A21X spark plugsSpark plugs are classified according to the temperatures at which they are designed to operate, HOT or COLDSee Figure 4-2 Selection of the correct spark plug depends on the type of ser