Author Topic: Spark plug  (Read 328 times)

Online jhg1958

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Spark plug
« on: 16.08. 2024 17:47 »
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
1961 Golden Flash S/Arm

Online groily

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Re: Spark plug
« Reply #1 on: 16.08. 2024 18:36 »
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!
Bill

Online limeyrob

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Re: Spark plug
« Reply #2 on: 12.09. 2024 18:45 »
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.
Slough 59 GF/SR

Online Colsbeeza

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Re: Spark plug
« Reply #3 on: 13.09. 2024 11:07 »
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
1961 Golden Flash
Australia