NGK or Champion

[roadrocket.chris]

i have been using champion n5 plugs in my my rocket with twin carbs and 10 to 1 pistons and believe it or not i used an L 10 in a zb32 i used to race nearly 50 years ago i dont know what to think.

[bsa-bill]

I could nearly bet Chris that if you still have that 50 year old L10 it would still work fine, a new L10 bought today would be a different story.
OTOH would you like to pay today's equivalent of the 3/6d the L10 cost 50 years ago - maybe I don't know what that would be

[roadrocket.chris]

they were 5bob then and i thought things were supposed to have progressed and improved over time but not so it would seem in the case of sparkplugs.

[Greybeard]

I could nearly bet Chris that if you still have that 50 year old L10 it would still work fine, a new L10 bought today would be a different story.
OTOH would you like to pay today's equivalent of the 3/6d the L10 cost 50 years ago - maybe I don't know what that would be

When I left school in the mid 60's I worked in a garage filling fuel tanks, (in those days you didn't serve yourself). You could buy 4 gallons of petrol for a pound and 4 spark plugs were also a pound.

[bsa-bill]

4 spark plugs were also a pound.

they were 5bob then

Guys your right they were 5 Shillings (Bobs indeed) for what seemed years on end.
So where did I get the 3/6d - that was the price of a gallon of petrol when I first started (1960)
that makes the plug almost 50% more then a gallon of petrol (very roughly) taking to extremes at today's fuel prices a plug should be around £8.50, actually aren't some about that

[roadrocket.chris]

When I left school in the mid 60's I worked in a garage filling fuel tanks, (in those days you didn't serve yourself). You could buy 4 gallons of petrol for a pound and 4 spark plugs were also a pound.

a bit off subject but you could also get a shot of redex for a penny

[BSA_54A10]

1) There is no profit in making standard plugs.
2) Standard plugs were designed to burn a non existant substance called "petrol"
3) NGK's tend to have "finer" settings than Champions. there are oft 2 or 3 NGK's spaning a single Champion grade.
4) I have seen just as many "standard" plugs of any brand of any age go bad directly out of the box
5) modern "fuel" which is not petrol is highly conductive so if it wets the plug then it is "all over red rover "

[A10 JWO]

Well blow me down.
Today I fired up the old girl after fitting a new SRM pump. After 30 seconds a gushing oil return. But ! It was firing on one cylinder R/H. I swapped the NGK plugs round and then it was L/H. Only three miles from new  . I found the new Champions I bought months ago which did not start the bike when new. Fitted the new ones and fired on all pots first kick. No logic to it ( confused.com ) I am.

Colin

[Beezageezauk]

Hey Colin,

Almost 200 postings on the forum and welcome to the wacky world of classic bikes.  Some things that should be explained can't be explained.  Some things that can't be explained should be explained.  It's all part of the adventure but when frustration sets in it sets in big style.

Enjoy your rides and remember....more miles means more smiles.

Beezageezauk.

[Mosin]

Can someone quickly confirm whether our 'A's use a 10mm or 12mm spark plug? I am at work and want to buy a Colourtune on my way home but I notice that there are two models available and I want to make sure that I get the right one!

Cheers! 

[A10Boy]

14 mm isn't it?

[Mosin]

Are you sure? I am now looking at this the other way round. Most people seem to recommend using NGK B6HS plugs in their bikes, but these seem to be a 14mm plug. I am getting more confused now!

[muskrat]

M14 x 1.25 = NGK "B" range, B7ES for alloy head, B7HS for iron head.
http://www.ngk.com.au/spark-plugs/product-information/part-numbering-system
Cheers

[A10Boy]

Mosin as soon as I hit the enter I remembered it was 14mm 

[wilko]

Are we talking about thread length or diameter?