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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Model Engine Spark Plug Question


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  #1  
Old 01-12-2015, 11:16:38 PM
OldIron46 OldIron46 is offline
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Question Model Engine Spark Plug Question

I pulled this, what I am assuming is a spark plug, off of a model engine that I have. The plug itself is too long for the engine, as it reaches the bottom of the cylinder.

I am in need of a plug with a shorter reach. A 3/8" reach.

This has a 10mm by 1mm thread.

Im not sure if this is a spark plug or not, as I have never seen anything like this. I am looking for someone that could possibly tell me where to find something like this.
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Old 01-13-2015, 12:29:19 AM
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James Bosma James Bosma is offline
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Default Re: Model Engine Spark Plug Question

Check here found info in scale model engineering forum
http://www.morrisonandmarvin.com/

Jim
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Old 01-13-2015, 12:42:54 AM
Thaumaturge Thaumaturge is offline
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Default Re: Model Engine Spark Plug Question

That type of plug is called a Surface Discharge type. Was used by Kawasaki on their twin two stroke A7 motorcycles. That was a BUHX type, but that has a 14mm thread. Try a search for surface discharge plug with the needed thread spec. Surface discharge helps resist preignition.
Doc
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Old 01-13-2015, 02:44:13 AM
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Default Re: Model Engine Spark Plug Question

You might try an NGK CM-6 plug. 10mm dia x 8.6mm reach.
Doc
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Old 01-13-2015, 06:33:55 AM
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Elden DuRand Elden DuRand is offline
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Default Re: Model Engine Spark Plug Question

Doc & Oldiron:

CM-6's are the 10mm plugs I use in most of my little engines.

Like all 10mm plugs, they have a tendency to foul. The upside is that they are cheap and usually available at most auto parts houses.
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Old 01-13-2015, 12:46:10 PM
Jamesk815 Jamesk815 is offline
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Smile Re: Model Engine Spark Plug Question

Oldiron46
Debolt Machine has them, and you can also get them at a Honda shop. I buy
a box of ten at a time . If you don't find any locally let me know and I can send you one.
Jim Gehringer
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