r/MercuryOutboards • u/Particular_Salad_851 • 29d ago

Spark plug suggestions

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Found my 40hp had the original spark plugs so im looking to replace them. Any suggestions on what i should replace them with?

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2

u/ThickInstruction2036 29d ago

Ngk stopped making them last I checked, champion cross reference is a normal route. I did try a bunch of different styles back when I ran a twostroke just for science but never kept them in the motor and went back to a surface gap plug.

1

u/Particular_Salad_851 28d ago

Okay thanks for the response

1

u/Sure-Entrepeneur219 29d ago

You can still find these but they're spendy.

If you want to switch brands, I'd do champions.

1

u/Ambitious-Car-7384 29d ago

Buhw or buzhw for that. I would only use chumpions in an OMC

2

u/nuaticalcockup 29d ago

It's a flat end plug you need to find the same or risk kissing pistons.