Spark plug

[jhg1958]

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

[groily]

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!

[limeyrob]

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.

[Colsbeeza]

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