Hi all,
I have a 28 557cc SV, what is the correct 18mm 1/2" spark plug for it I have a selection but all different makes also a Champion which has the wrong thread size a slightly to small which I think is a counterfit one which has gone in the bin.
I have been onto the green company for one but there is so many different types, even looking through my old books they all seem to recommend different types. Regards Clive.
18mm spark plug
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tony.barnett
- Holder of a Silver Anorak

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Re: 18mm spark plug
I use NGK AB6.
KOBI
Ex Swindon Branch Combined Operations (Chairman and Secretary)
Ex General Secretary of the AOMCC
Ariels - 1913 TT Model, 20 Roadster, 28 Model D, 30 Model B, 38 VH, 52 VH
Velocette MAC, KSS Mk1
Ex Swindon Branch Combined Operations (Chairman and Secretary)
Ex General Secretary of the AOMCC
Ariels - 1913 TT Model, 20 Roadster, 28 Model D, 30 Model B, 38 VH, 52 VH
Velocette MAC, KSS Mk1
Re: 18mm spark plug
Thanks Tony will get a NGK and try it also trying to get the carb right but thats another story the joys of a nearly 100 year old bike. thanks again Clive.
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