Spark plug recommendations?

Information relating to the Matchless G12 or AJS Model 31 650cc twin
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Re: Spark plug recommendations?

Postby alanjennings » Thu Jun 06, 2019 7:05 am

Yes, I was as usual " confused!" 12 thou for the mag and I set my plugs " by eye!"
Alan [Morini] Jennings

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Re: Spark plug recommendations?

Postby mjf65 » Mon Jun 10, 2019 7:45 pm

Just checked the points gap and it seemed a bit wide at an easy 0.015, I've closed them up a bit to 0.012 and fitted new Champion plugs gapped between 0.020 - 0.024 so we'll see if that helps with starting but not tonight looking at the window in not so sunny Gloucestershire.

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Re: Spark plug recommendations?

Postby JEAN-NOEL » Tue Jun 11, 2019 1:04 pm

Hello Michael,
what is your bike ? For 1964-on and CSR G12/31 the Parts Service states N4C instead of N5C
Cheers

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Re: Spark plug recommendations?

Postby mjf65 » Tue Jun 11, 2019 7:33 pm

Jean-Noel mine is a 1960 Model 31 so N5C is the standard fitment.

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Re: Spark plug recommendations?

Postby 56G80S » Tue Jun 11, 2019 7:42 pm

IKBA but won't closing the points gap up retard the ignition if that was set while the points were at 15thou?

Johnny B

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Re: Spark plug recommendations?

Postby mjf65 » Thu Jun 13, 2019 6:25 pm

I reset them to 12 thou as detailed in the handbook, I assumed that they open up with wear? I haven't gone near points since I had a Z250 Scorpion twin in 1982.

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