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The Marston Sunbeam Club & Register Forum

General Category => Technical Discussion Forum => Topic started by: Thomas on November 06, 2017, 08:19:32 AM

Title: What spark plug
Post by: Thomas on November 06, 2017, 08:19:32 AM
Hi all!
I am looking for a new spark plug for my 1937 Model 9. In the forum I found information that the NGK AB-7 should be fine. Its thread is 18mm but mine needs 14mm. What plug with14mm thread is recommended?
Cheers, Thomas
Title: Re: What spark plug
Post by: VicYouel on November 06, 2017, 10:45:38 AM
I suggest you ask http://www.gsparkplug.com/  they are very helpful. The important thing is to use a plug that does not have built in "suppression" for use with a magneto.

I am sure the forum would like to know how you get on.

Vic
Title: Re: What spark plug
Post by: Thomas on November 06, 2017, 01:35:05 PM
Well, I had hoped to get these information from those who drive the machines.  :(
Title: Re: What spark plug
Post by: phutton on November 07, 2017, 04:54:18 PM
The plug specified for the 1937 M9 is a Lodge H14. This is a 14mm x 1/2" (12.7mm) reach plug. It is now unavailable, but the nearest modern equivalent is the NGK B6HS, or Bosch W7AC. Try one and see!

P.
Title: Re: What spark plug
Post by: Thomas on November 08, 2017, 12:42:46 PM
Thank you, Paul, I ordered a NGK B6HS. Cheers, Thomas
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