There's way more than enough spark energy present anyway...That's part of the problem, too much energy, causing interference....Every DA, 3W, and almost all foreign engines use CM6 non resistor spark plugs and completely shielded systems, from the plug cap to the ignition box....The plug wires are carbon center...They have way less spark energy coming from the ignition and still work fine...Those little CM6 spark plugs are gapped at about .015..Doesn't take a lot of energy to jump that gap...I have gapped the RCJ7Y plugs in my conversions to .050, they still work fine..I took the side electrode clean off one of the plugs, the engine would start and run but started to miss about 3000 rpm...That's with a circuit drawing about 180 ma..I suspect a C&H twin circuit that draws 450 or so ma would work with that spark plug pretty well, maybe some day I'll try it..