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Join Date: Nov 2007
Location: Chandler, Arizona
I see no reason to replace ANY brand or type of spark plugs as long as the bike is running good, starting good, and gas mileage is still normal. These things will change when the plug gap gets too big, then it's time for new plugs. But, if you use NGK plugs, they are cheap enough to replace once in a while just to make you feel better, if it does. I'm a little unhappy about having to replace 4 plugs in a 2 cylinder engine, when other 2 cylinder engines run just fine with just 2 plugs. It doubles the cost, and for nothing. However, I am happy the Vulcan's plugs are easy to change, some motorcycle plugs are almost impossible to get to. The Suzuki Savage requires removal of the seat and tank to get to the plug. But at least there is just one. Try changing the plugs on a '93 Kawasaki ZX11. It takes half a day.
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