Spark plug? -1937 Muncie Neptune O B12A

[Buccaneer]

Anyone have a spark plug chart showing the correct 18mm spark plug
for the 2 HP, 1937 Muncie Neptune O B12A?

Could not find it on any of my data, nor online.

Thanks.

Prepare to be boarded!

[MIKE SIMS]

From notes I have I can not see an OB12A, only an OB12. Earliest ’42 chart says an 6M, ’55 chart says 6MJ and my ’65 chart says K-15J

[Tubs]

Old Outboard Book says – 6M
Old Outboard Book cross over chart says – K15J.
Internet search –
• Autolite 386
• Champion D14
• Champion D14013
• Motorcraft BTS8F4
• NGK 1010
• NGK 2910
• NGK A-6
• NGK AB-6
• NGK AB6
• NGK stk 2910
Tubs

A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.

[Buccaneer]

Thank you both. I always forget about the “Old Outboard Book”,
that was sitting two feet away, underneath some papers!
I put a D16 in the one I fired up yesterday. Can’t remember
if that’s Hotter or Colder than the recommended D14,
but I have a chart for that!

Prepare to be boarded!

[Tubs]

Just looking at the gas cap you made for the 36.
Pretty cool!!!
Tubs

A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.

[Buccaneer]

Thanks Tubs. I was amazed it actually fit and
screwed on okay. Internal threading in a blind
hole is a challenge for me!

Thanks for the spark plug data.
I found some D-14’s so the little Neptunes
should be “good to go”.

Tubs wrote:

Just looking at the gas cap you made for the 36.
Pretty cool!!!
Tubs

Prepare to be boarded!

[Author]

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