champion plugs

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seattle##gs

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The atlas is supposed to use a Champion N6Y and the commando uses Champion N7Y. Is the only difference the compression ratio?
 
seattle##gs said:
The atlas is supposed to use a Champion N6Y and the commando uses Champion N7Y. Is the only difference the compression ratio?
Click to expand...
The number indicates plug temp range, 6 being colder than the 7
Usually a fair amount of overlap im the heat ranges, so should not be a problem using commando plugs on atlas. This is how well plug sheds heat away from its tip...not the operating temp of the engine. More heat means better self cleaning of tip with risk of tip erosion if too hot, less heat means potential to foul sooner but better tip protection.
 
Watch out for NGK Chinese forgeries.
Had quite a go with them not long ago.
Hair pulling at best. Tossed in 2 Champions and all of a sudden everything was beautiful.
NGK knock-offs would last about 20 min to an hour then stumble out, foul, then quit.... eye twitching like Inspector Clouseau's boss (Pink Panther ref)
Cheers
 
Buy from a reputable source.
champion plugs
champion plugs
 
I have several NOS Champion N3xx that I've been using in my Atlas (9:1) and the Matchless ?:1 (no 12:1 pistons available in 0.100 oversize so I don't know what the compression ratio is with flat top pistons).

When did Champion change the heat range designation scheme? #seattlegs writes that it's Champion N6 and 7 which sounds like an NGK numbering scheme. I haven't bought plugs for any of my bikes in decades because I have boxes of good used ones pulled from bikes that came into the shop for tune-ups that had nearly new plugs in them.

That said, I had trouble finding AC42 for my 6 cyl. Chev truck so when I did find them I bought several boxes of them. That is an application where you don't want too hot a plug as it runs WOT most of the time. Factory spec for the 2-ton was C42-1 which are no longer available. The C version had bigger center electrodes.
 
Where do I get some Champion N7Y C plugs nowadays ? Always liked them . Toronto , Canada .
Been using the knock off NGK's without knowing the packaging differences , duh .
 
N7YC plugs are getting harder to get as they are turning to resistor plugs manufacture when I heard this I stocked up on my N7YC plugs, running the Joe Hunt maggie I get very long life out of my plugs so have enough for a few years to come, my Norton runs better with Champion plugs, have tried NGKs and after a week or too I get a misfire from them, haven't tried them with the JH, I just use what works best for my Norton.
After owning my Norton since new it lets me know what it likes the best lol.

Ashley
 
ashman said:
N7YC plugs are getting harder to get as they are turning to resistor plugs manufacture when I heard this I stocked up on my N7YC plugs, running the Joe Hunt maggie I get very long life out of my plugs so have enough for a few years to come, my Norton runs better with Champion plugs, have tried NGKs and after a week or too I get a misfire from them, haven't tried them with the JH, I just use what works best for my Norton.
After owning my Norton since new it lets me know what it likes the best lol.

Ashley
Click to expand...
I have always used NGK BP7ES with my Morris/ Hunt mag on a Dommie 500. Worked perfectly through years of racing. Repco usually have them on the shelf.

And on my Mk11 850 as well come to think of it.

If you have clearance to fit them projected plugs are great.

There are several excellent videos on you tube which describe how to check your NGK plugs are real.
 
Last edited:
Thomasa said:
I have several NOS Champion N3xx that I've been using in my Atlas (9:1) and the Matchless ?:1 (no 12:1 pistons available in 0.100 oversize so I don't know what the compression ratio is with flat top pistons).

When did Champion change the heat range designation scheme? #seattlegs writes that it's Champion N6 and 7 which sounds like an NGK numbering scheme. I haven't bought plugs for any of my bikes in decades because I have boxes of good used ones pulled from bikes that came into the shop for tune-ups that had nearly new plugs in them.

That said, I had trouble finding AC42 for my 6 cyl. Chev truck so when I did find them I bought several boxes of them. That is an application where you don't want too hot a plug as it runs WOT most of the time. Factory spec for the 2-ton was C42-1 which are no longer available. The C version had bigger center electrodes.
Click to expand...
Champion and NKG are opposite in the heat range numbers but they more-or-less crossover in the range used for Norton.

This compares several manufacturers: https://briskplugs.co.uk/pages/brisk-spark-plugs-temperature-heat-scale-cross-reference-chart
 
Torontonian said:
Where do I get some Champion N7Y C plugs nowadays ? Always liked them . Toronto , Canada .
Been using the knock off NGK's without knowing the packaging differences , duh .
Click to expand...
I like The Green Sparkplug Company in UK for most ign parts, very good prices and low shipping costs. Got my last batch of N7YC's from them a year ago.
 
I just have to say that I know people who swear by NGK and others who swear by champion, and both groups seem to think the other group is delusional... I was tortured by an intermittently bad spark plug myself so I know spark plug hatred very well.... 🤣
 
ashman said:
N7YC plugs are getting harder to get as they are turning to resistor plugs manufacture when I heard this I stocked up on my N7YC plugs, running the Joe Hunt maggie I get very long life out of my plugs so have enough for a few years to come, my Norton runs better with Champion plugs, have tried NGKs and after a week or too I get a misfire from them, haven't tried them with the JH, I just use what works best for my Norton.
After owning my Norton since new it lets me know what it likes the best lol.

Ashley
Click to expand...
Actually, Wassell has plenty of them. I don't stock them as most seem to use NGK. I do stock small numbers of N3 and N4 because many Triumph owners still use them. However, Wassell is out of N3/N4 right now and expects them to be back in stock in July.

The N7YC come in boxes of 10 and would cost me around $3.50 USD each delivered to me. If 4-5 people in the US told me that wanted a pair, I would be happy to get them and in that case, I would sell two for $7.00 (no profit) plus actual shipping. It would be silly for someone outside the US unless they wanted enough pairs to make the shipping not hurt so much or if they ordered other things at the same times, again to keep the overall shipping down.
 
BP8 's are pretty cold for a stock Commando and yours look either that or rich. I used to run NGK BP6ES for city commuting on my MKIII, 7 on the road. I have run a B8 in the G80 but I've found it starts easier with the N3 Champion. The 9.2 CR Atlas likes those too but I only have 3 left. Then it's back to my buckets of used BP7ES NGK. Got lots of Bosch plugs pulled from BMWs too. I may never have to buy a spark plug again, though I may spring for some more Champion N3.
 

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