1973 merc 402 40hp. . . what should spark plug gap be
ekern68 Cadet Joined Aug 28, 2010 Messages 17 May 22, 2011 #1 1973 merc 402 40hp. . . what should spark plug gap be
Barnacle_Bill Admiral Joined Feb 8, 2004 Messages 6,469 May 22, 2011 #2 Re: spark plug gap That motor calls for a plug like NGK BUHW. It is a surface gapped plug so there is no setting.
Re: spark plug gap That motor calls for a plug like NGK BUHW. It is a surface gapped plug so there is no setting.
