Hello All,

Probably been talked about many times.
Plugs.
Currently using NGK though seem to fluff easy.
Using
NGK B6HS
NGK B7HS

Most of the factors here just stock the NGK.
Before i was using L10 Champion.
Bike runs perfect and the colour is correct on the electrode.
Been a couple occasions that after a long run and parking up.
When start,result will run then die,plenty of spark.
In with another plug away you go perfect.
The Pre-Mono Block is the correct model as choke size and brass slide perfect tolerance,have the correct jets in the carb on the middle notch on the needle.
I can rule out the Carb, as the bike runs great idles fine and usually starts first time.
So what is the best plug? Books says L10-N8 for certain models.
Or early book goes KLG F70 or L777
Have had the same with the other bikes i have BSA A70 Sunbeams S7 Deluxes,they chuck NGK plugs..so what the best?
Lodge,
Bosh.
Champion.Etc Etc?

What you all running with the crap fuel quality?
Also Needle Setting and Jet size?

PS As a member of the Scottish Military Vehicle Ass.(SMV)
A fellow member gave me a copy of the M20 Maintenance manual.
Maybe you all have it?
Its the real McCoy and really good.Maybe handy for the site?
Who is interested?

As below.


Book No. 100/BC2C
Air Publication No. 1657B, Vol.1. Parat2

Maintenance Manual

And

Instruction Book

For

MOTOR CYCLE (SOLO)

500 c.c. s.v.

Model M20

email (option): graemey1@hotmail.com

Aye there Greamy,nice to see you back again,in response to your plug problems,I am using ESSO Z-29 plugs in my WM20,they work fine,I currently have a full box of them,if you want contact me and I will send you a couple.

email (option): glesgaman@tiscali.co.uk

I've always run Champions without any problems...L82C is the modern number for the iron head or N5C for the alloy heads....Ian

email (option): ian@wright52.plus.com

Hi,
I am using the "Champion" L86-C which supposed to be the replacement for the Discontinued "Campion" L-10.
After using few other replacements I found this one the best for easy one kick start and running. Very close specs to the L82-C Ian is using and also copper cored like the original.

Another very good one is the less common Spark plugs E175/14 made by "Beru".

Noam.

email (option): noam10@gmail.com

Last year, when putting the bike in hibernation-mode, I put a new L-82C - like I always use - in the head.
This week, I checked ignition, everything, but I could jump up and down, no way to wake the engine up
Then in upper frustration , I changed back to the discarded plug, and she became a one-kick starter again...
Explanation anyone ?

email (option): viaconsu # planet dot nl

Hi Hans.

sometimes condensation of humidity at the top (head),
mostly if In or Ex valves left opened, can cause the sparkplug to act as a "short current" for high voltage.
If you have some time to "Play" you can try burning the plug with some petrol.

many times it comes back to life..

Noam.

email (option): noam10@gmail.com

hans it would have started next kick on the old plug you just gave to soon also i have read on this forum that the plug gap is crucial dont know it at the moment