Hi your coil is built into the plug cap so no HT leads, i dont think it will be a an arcing problem.
Garter
September 2008
try running it in the dark at night and look round about the spark plugs.I suspect one of your plug caps/leads is shorting out.That'll be the clicking noise.you also may be able to see a bright blue or yellow spark jumping from a lead.cap.to the engine.