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Hi all not whiskered a plug since my 2smoke days .wondered what heat range plugs i should be looking at 1951 standard ES2 +40piston etc .NGK b6es in at present long reach?ordered Champion N56?
I've been running an NGK…
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I've been running an NGK BP7hs in my '52 ES2, I found the thread in the head too short for a 3/4" plug and too deep for a 1/2" plug, hence the use of an extended core nose type plug. I find the insulator stays nice and clean without overheating (generally cruising at 55 - 60 MPH)
John