The BSA A7-A10 Forum

Technical => Lucas, Electrical, Ignition => Topic started by: Felters on 16.09. 2011 05:59

Title: A7 Spark Plugs
Post by: Felters on 16.09. 2011 05:59
I've done a search but there seems to be a variety of advice... there's a surprise.

So the conventional wisdom from the suppliers is that the Champion L82C is the replacement for the L10S. Yes?

'59 Iron head A7 - not raced or thrashed but will be used regularly. What would you buy?

Cheers
Mike
Title: Re: A7 Spark Plugs
Post by: bsa-bill on 16.09. 2011 07:21
My Flash should use L82c but they tend to soot up a bit, I use L86c

Others will comment and give you a general view
Title: Re: A7 Spark Plugs
Post by: muskrat on 16.09. 2011 10:13
NGK B8HS for my money. Never did like Champs.
Cheers
Title: Re: A7 Spark Plugs
Post by: Goldy on 16.09. 2011 10:42
I always use L82C and they work fine. i never like NGK as they don,t seem to last very long.
Title: Re: A7 Spark Plugs
Post by: t20racerman on 16.09. 2011 19:17
NGK B8HS for my money. Never did like Champs.
Cheers

Me too  *smile*
Title: Re: A7 Spark Plugs
Post by: bsa-bill on 16.09. 2011 19:59
way hay -  a plug thread
Title: Re: A7 Spark Plugs
Post by: wilko on 16.09. 2011 22:11
I don't like either, i use 2nd hand KLG's!
Title: Re: A7 Spark Plugs
Post by: Brian on 17.09. 2011 02:32
Actually considering you are in the UK and are probably dealing with low octane and possibly ethanol fuel I would suggest a B6HS or a B7HS at the coldest. A L82C Champion is equivalent to a B6HS.

A B8HS as Muskrat suggested would be fine here in Aus as we get 98 octane fuel with no ethanol in it.

I know we have been over the spark plug thing a hundred times so I can only relate my personal experiences, I have been using NGK plugs for about 40 years and have found them very good. I have had a couple of duds but that would work out to about .005% of the plugs I have bought. The plugs in all my A's are the ones I put in when I put the motors together, some have done 20,000 miles. I clean and gap them whenever I think of it (not very often). So far, fingers crossed, I have never had to change one.
Title: Re: A7 Spark Plugs
Post by: bsa-bill on 17.09. 2011 10:18
I've had some encouraging results with Bosch silver electrode plugs, I'm a bit uncertain about the heat range equivalence and they have a very thick wall on the threaded part which might affect the heat range, there supposed to have a wider range I think.
During my starting woes they where the the only plugs that would start  the engine at times, however there were other issues involved.
Got the plugs from The Green Plug Co, no interest in the firm other than had good service from them and a lot of info on their site