All I know is that Eraldo Ferracci would insist on using those OEM metal clad spark plug caps (over brownish phenolic looking innards) on the 851 Ducatis. And FWIW, Dr John once told me by running .025 or .028" gaps I was losing torque. He said use .035. YMMV...
What I'll never understand is how you can have ignition wires with a core of material that would not appear to be of a conducting material (silicon core, plastic looking shite).
My grandfather who was a NYC cop spent the last few years working in a NYPD garage as a mechanic and supervisor rather than a desk job after getting hurt while serving as a motorcycle officer in upper Manhattan. He was one of the lucky few to ride the old Indian police bikes in the 50's and 60's.
Anyhow, your recalling Dr. John reminded me of a trick he taught me back when I was a kid, that increasing plug gap on an air cooled engine or high powered motor would result in more power and torque, but you had to have a healthy fuel and ignition system, or you would hobble the motor. He was also a fanatic about indexing the plugs to get as ideal and equal combustion as possible. Man I miss him.
I prefer the R plugs to non R plugs with or without R caps. They result in a cleaner spark (as was stated earlier) due to the resistor.
Use what makes you most comfortable. I've had similar performance from ND and NGK plugs, but prefer old school copper NGK's or BOSCH to just about anything.
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