Plug gap for Mercury 20HP OG683980

Helly · #1 October 5th, 2008, 01:38 PM

Need to know proper spark gap for plugs NGK BP8H-N-10. Thank you in advance for any help.

bhile · #2 October 5th, 2008, 01:52 PM

Helly · #3 October 5th, 2008, 02:32 PM

Thanks for the info. BTW this is not my motor. Just trying to help a friend get back out on the water where we all should be instead of typing in a forum. Anyway thanks again.

achris · #4 October 5th, 2008, 04:16 PM

The gap is in the plug number BP8H-N-10

The '10' is the gap in 1/10th of a millimetre... so a -10 is 1.0mm, a -15 is 1.5mm.

1 millimetre is 39.4 thou.