Plug gap for Mercury 20HP OG683980

[Helly]

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

 

[Barnacle_Bill]

Re: Plug gap for Mercury 20HP OG683980

.040

 

[Helly]

Re: Plug gap for Mercury 20HP OG683980

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]

Re: Plug gap for Mercury 20HP OG683980

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.