Spark Plug Caps

Blue Bomber · May 25, 2012

What are the proper spark plug caps for a '73. Would they be metel or a colored plastic.

L.A.B. · May 26, 2012

Blue Bomber said:
What are the proper spark plug caps for a '73. Would they be metel or a colored plastic.

Black plastic "Champion" caps: http://www.classicbike.biz/Norton/Broch ... LineUp.pdf

batrider · May 26, 2012

These don't like rain. Good for museum purposes maybe.

Blue Bomber · May 26, 2012

Thanks- that is what is on it now.

Tim_S · May 28, 2012

I like the NGK caps and they are black,,,,,,,,

Tim_S

Whitworth Ranch · May 29, 2012

NGK for functional superiority. I use 5 k ohms resistor to match the Tri-Spark I use. I like the look of Champion. I was going to use ones from an older 3.8-liter Jaguar XK motor, but the resistance is too high. I never found Champion 5 k ohm resistors.

http://www.englishparts.com/products/Ja ... CX600.html

They are usually marked. On the car, I had to find rubber boots to cover the joint between the wire and the boot to keep water out.

Anyway, I am pleased with the NGK.

shrugger · May 29, 2012

Yeh!! whats up with that Champion?!?
I run the 5k NGK's and they work perfectly. My only complaint is that they are not Champion. :cry:

Ron L · May 29, 2012

batrider said:
These don't like rain. Good for museum purposes maybe.

Those are on three of my Commandos and I have never had a problem, including in pouring rain from Tampa to Atlanta. Perhaps they fit loosely on the cable? I use copper core Packard 440 cable because it is black and looks original. For non-original I like Taylor wires and boots. This is just what works for me with RITA, Boyer analog, and Tri-Spark ignition.

batrider · May 29, 2012

Just going by what happened to my original Champion caps as supplied stock. Had arcing in a terrific thunderstorm on Rt 81 above Scranton. Bike was nearly brand new at the time. I went to Sparkys (used on outboard motors) for a long time, like 30 years. Now using NGK 5K resistor caps (supplied with Pazon Altair).

Note that Boyer analog and Pazon Sure-Fire ignitions don't require any resistor caps or resistive wires.

Saber13 · Jun 6, 2012

I have not tried it on my CDO, but in my old Hot Rod days we used to hit the distributer cap and plugs with hairspray after we had it all back together. Ran through a lot of mud and standing water without ever loosing spark.

Spark Plug Caps

Blue Bomber

L.A.B.

Moderator

batrider

Blue Bomber

Tim_S

Whitworth Ranch

shrugger

Ron L

batrider

Saber13

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