The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => Lucas, Ignition, Charging, Electrical => Topic started by: jhg1958 on 16.08. 2024 17:47
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I think I am an idiot. I wanted a spare set of plugs so I took mine out to take to the motor factor shop. When I got there I found they were Champion L82C. A short reach plug. I can only assume these were the ones that was in the bike when I got it. I would have put them in to prevent things dropping into through the plug hole.
I see I bought some NGK B7ES but the Haynes manual states NGK B7HC.
I am a bit confused perhaps I need to go back and buy some B7HC plugs.
On the positive side, the GF ran fine on the L82C. Just a forgiving bike I suppose.
John
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It's all about the reach - and the cyl head. Iron head = short eg NGK B6HS etc, alloy 3/4 inch as in B6/7ES or Champ N4/5 or equiv. You're not an eejit!
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Its not a disaster if you put a short reach in a long reach (ally) head by mistake, but it is if you put a long reach in an iron head so check and check again.
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John, I presume you have an alloy head on your Flash?. I run L82C's in my 1960 Flash with iron head, and they are very reliable.
Col