1980 Mariner outboard (Yamaha) 40hp sparkplug type needed

guy48065

Chief Petty Officer
Joined
Aug 31, 2008
Messages
568
I have a multi-function display I'm adding to my old pontoon and it has the option of adding a cylinder head temperature sensor that is sandwiched under the plug. I can't find my outboard in any of the tables at Champion or NGK and I'm 200 miles from the boat. Little help, please? The sensors come in 10, 12 & 14mm rings.

Mariner 5M
661
 
Top