Spark plug type

Information relating to the Matchless G3 or AJS Model 16 350cc Heavyweight
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Expat
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Location: Tennessee, USA

Spark plug type

Post by Expat »

Help needed please men, have searched around and haven’t found a definitive answer as to suitability of NGK BR6 and BR7ES spark plugs for my bike as local auto stores here don’t have the regular B6 or B7ES. I understand they are the resistor type but will that cause issues with the coil ignition system? Thanks
Keep shiny side up.

These are my principles, if you don’t like them, I have others. (Groucho Marx)
Groily
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Re: Spark plug type

Post by Groily »

Think they should be quite OK, it's only really with magneto ignition that the R versions are best avoided. The presence of a resistor shouldn't affect coil ignition. NGK 6 and 7 are good numbers for most of our machines, broadly comparable to Champion N5C and N4C.
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Expat
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Re: Spark plug type

Post by Expat »

Great, thanks Bill. It’s a seventeen mile ride to the store, so I lived dangerously while in town food shopping and bought one of each on spec.
Keep shiny side up.

These are my principles, if you don’t like them, I have others. (Groucho Marx)
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Expat
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Re: Spark plug type

Post by Expat »

Deleted (I think!) duplicate post.
Keep shiny side up.

These are my principles, if you don’t like them, I have others. (Groucho Marx)
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