Author Topic: Spark plugs  (Read 320 times)

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Fereday

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Spark plugs
« on: 03 May, 2017, 16:50:56 »
Hello again just a quickly . I've run my thunderbolt on champion nc3 plugs for about 100 miles and the wright hand side seems to be breaking down what plug would be suitable. Thanks

JulianS

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Re: Spark plugs
« Reply #1 on: 03 May, 2017, 17:10:53 »
N4 was listed up to 1968 then  N3/NC3.

But NC3 should be OK. Its just a slightly colder plug.

If the electrode or insulation is breaking down then its getting much too hot and there is a problem which needs sorting - over advanced timing or too weak mixture being possibilities.
« Last Edit: 03 May, 2017, 17:20:27 by JulianS »

STAR TWIN

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Re: Spark plugs
« Reply #2 on: 04 May, 2017, 06:30:17 »
My bikes have never got on wel with Champion plugs. Try NGK B7ES.

TTJOHN

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Re: Spark plugs
« Reply #3 on: 04 May, 2017, 09:23:11 »
The book states N4 plugs for the Thunderbolt, with resistive HT lead.

Regards TTJohn