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Join Date: Nov 2007
Location: Chandler, Arizona
Ok I'll try to keep this simple, but short may be asking too much. I HAVE used iridium plugs in my Vulcan, they were in there about 15,000 miles. I got them to try and improve hot starting, as there was nothing else wrong. I COULD NOT TELL THE LEAST BIT OF DIFFERENCE in any way. net plug change I went back to the cheaper NGKs. It still sometimes has hard start problems. I now believe this to be more in the fuel system. The NGK plugs give a nice big fat blue spark while the engine is being turned over by the starter.
While we all know the Vulcan has a weak CHARGING system, I have seen nothing to indicate it has a weak ignition system. Mine sure doesn't. Plus, it has FOUR plugs. I never understood why, but it does run better with 4 than 2. I suspect the reason for that is plug placement. None of the 4 plugs are placed in the right position for use as single plugs.
In short, I've been hearing about the iridium plugs for years now, tried them, and found no difference except for what they cost. Seafoam on the other hand..........
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike