Need to know right plugs and gap for 1978-200hp.Merc.dont have mod-ser.no.handy,Thanks
B Basman7 Cadet Joined Aug 13, 2005 Messages 7 Sep 28, 2005 #1 Need to know right plugs and gap for 1978-200hp.Merc.dont have mod-ser.no.handy,Thanks
A andy6374 Lieutenant Commander Joined Aug 4, 2005 Messages 1,617 Sep 28, 2005 #2 Re: Spark plugs No gap. I think all V6 mercs of 78-early 90's use NGK BU8H.<br /><br /><br />You can find out for sure at the NGK USA website.
Re: Spark plugs No gap. I think all V6 mercs of 78-early 90's use NGK BU8H.<br /><br /><br />You can find out for sure at the NGK USA website.
B Basman7 Cadet Joined Aug 13, 2005 Messages 7 Sep 28, 2005 #3 Re: Spark plugs Thanks but would like to crossover if possiable,to a gap plug,Thanks again
A andy6374 Lieutenant Commander Joined Aug 4, 2005 Messages 1,617 Sep 28, 2005 #4 Re: Spark plugs Just be careful. Make sure there is clearance for the stroke of the piston.
timmathis Lieutenant Joined Apr 24, 2005 Messages 1,295 Sep 28, 2005 #5 Re: Spark plugs You don't want to do that! They will not work/fit anyway. Do you have a problem with the marine plugs? Tim
Re: Spark plugs You don't want to do that! They will not work/fit anyway. Do you have a problem with the marine plugs? Tim
B Basman7 Cadet Joined Aug 13, 2005 Messages 7 Sep 29, 2005 #6 Re: Spark plugs Just thought maybe that older motor may run better with a hotter plug, thanks.
