Does anyone have a really favorite spark plug (big threads) for a fresh, stock UL engine? I used some plugs I had laying around, (Champions, recent manufacture, probably for a knucklehead) and I've fouled out the rear one already. However...running the engine very rich, before I accepted just how lean I had to adjust that Bendix to run right, probably did not help. Anyhow...who makes/manufactures such a plug at this time, and what would the #s be?
Or, does anyone make the old, 1-2-3-4 heat range plugs?