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spark plug cap size
Posted: Tue Apr 28, 2026 12:48 pm
by Simonpsmith
Have just bought Champion D9 spark plug - but the current plug cap (LB05EH) doesn't fit as the spark plug is wider than the old one.
I could use a spade end fitting but would like to know if there's a plug cap that fits?
Re: spark plug cap size
Posted: Tue Apr 28, 2026 2:33 pm
by simon.holyfield
The plug is missing it's screw-on terminal!
Re: spark plug cap size
Posted: Tue Apr 28, 2026 5:11 pm
by Simonpsmith
answered my own question:
None of the NGK plugs caps fit the Champion D9’s.
But these do:
Pattern Spark Plug Cap R90 Black Water Resistant Rubber Lodge No Resistor
https://www.gsparkplug.com/1x-pattern-s ... istor.html
Re: spark plug cap size
Posted: Thu Apr 30, 2026 9:18 am
by nevhunter
Don't use resistor Plugs, caps or leads with Magneto's. Often those screw on ends come Off. Spring clips are safer . A lead coming off can damage a Magneto coil unless it has a safety gap in it somewhere. Nev
Re: spark plug cap size
Posted: Thu Apr 30, 2026 9:41 am
by Simonpsmith
Yes, in the end I decided to fit a spade end and thumb nut on the plug - looks right for a 1933 bike
Re: spark plug cap size
Posted: Fri May 01, 2026 1:05 am
by nevhunter
What Bike is it, may I ask.? Nev
Re: spark plug cap size
Posted: Fri May 01, 2026 9:37 am
by Simonpsmith
nevhunter wrote: Fri May 01, 2026 1:05 am
What Bike is it, may I ask.? Nev
500 Red Hunter (now added to my signature
)
Re: spark plug cap size
Posted: Sat May 02, 2026 6:09 am
by nevhunter
18 MM plug thread. That heat range should be about right but it's a BIG Plug. Lucky fellow. Nev