Using NOS plugs - Champion N57R

Information relating to the Matchless G85 500cc Heavyweight, AJS 7R, Matchless G45 and Matchless G50
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Location: Massachusetts, USA

Using NOS plugs - Champion N57R

Postby Scout63 » Wed May 13, 2020 2:25 am

I pulled the plug from my new to me 1961 G80CS and it is a clean Champion N57R. I have never seen this type of plug with a shrouded electrode. I bought a box of 10 of these plugs unused in original packaging on eBay as I couldn’t find them new. Is it ok to use old unused plugs? Is there a better plug for this model? Thanks.
Ben Zehnder - Orleans, MA USA
1961 Matchless G80CS
1971 BMW R75/5
1972 Norton Commando Combat Interstate
1978 Yamaha SR500
1979 Moto Guzzi V1000G5 - current project

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Re: Using NOS plugs - Champion N57R

Postby bjorn » Wed May 13, 2020 2:03 pm

Hi Ben,
The N57R is for racing only, with an open pipe. The "R" stands for retracted gap. These plugs are good, but can oil up if you have a motor that burns a lot of oil. The N57R corresponds to an NGK B10.

For street use on a G80CS with a silencer, I use a Champion N3 which corresponds to an NGK B7.

regards
Bjørn

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Posts: 18
Joined: Wed May 06, 2020 2:58 am
Location: Massachusetts, USA

Re: Using NOS plugs - Champion N57R

Postby Scout63 » Thu May 14, 2020 10:41 am

Thanks Bjorn. Ben
Ben Zehnder - Orleans, MA USA
1961 Matchless G80CS
1971 BMW R75/5
1972 Norton Commando Combat Interstate
1978 Yamaha SR500
1979 Moto Guzzi V1000G5 - current project

Member
Posts: 3
Joined: Thu Mar 19, 2020 11:47 pm
Location: Florida USA

Re: Using NOS plugs - Champion N57R

Postby gtx469 » Fri Jun 05, 2020 2:22 pm

A good N3C plug replacement I run in my 61 Matchless G9 twin and also my BSA Lightning 650 is the E3.18 plug. never had a spark issue with these bad boys. Its a direct replacement for the N3
Larry Larivee

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