What sparkplugs for OMC 4 cyl

kooter

Recruit
Joined
Jul 7, 2010
Messages
4
1976 4 cyl OMC 140 hp, OMC electric shift drive

Stupid newbie question......... What spark plugs do I use??

When I bought this boat, the engine was already out and partially disassembled. I rebuilt the engine, and am getting ready to put it back into the boat. The spark plugs were all missing when I started this project, so I didn't have anything to go off of to get new plugs.

NGK lists these here http://www.ngksparkplugs.com/part_finder/watercraft/step3.asp

1985-1973 Stern Drive 14mm Hds Taper Seat

And then a bunch of TU, DU, GU, etc..... but none of those have years.

Thanks in advance
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,308
Re: What sparkplugs for OMC 4 cyl

Ayuh,... If they're 14mm,... Use AC Delco, MR43T plugs,...
If it older enough for the 18mm plugs, you'll have to look 'em up, as I don't remember the #s...
 

superbenk

Commander
Joined
Oct 27, 2008
Messages
2,033
Re: What sparkplugs for OMC 4 cyl

Bond-o is right... AC MR43T or Champion RBL8 according to the Solec manual.
 
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