I installed new NGK standard plugs last April when I was reviving it from the 20 year sleep the bike had endured. I've put almost 8000 miles on her since. I decided to put in new NGK DPR7EIX-9 Iridiums last week. What a difference. Starts even easier, runs smoother with little or no low speed stutter, and the throttle response was improved.
I highly recommend these plugs to anyone....
Spark plug change to Iridiums
Moderators: the2knights, Highway Rider
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EZdriver
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Spark plug change to Iridiums
Patriot Guard Rider Long Island
1994 Kawasaki ZG1200 Voyager XII (Current ride)
2003 Victory V92TC (sold)
1988 Kawasaki Voyager XII (sold)
1970 Yamaha 400 Enduro
1969 Kawasaki 500 Mach III
1960 Cushman Scooter
1994 Kawasaki ZG1200 Voyager XII (Current ride)
2003 Victory V92TC (sold)
1988 Kawasaki Voyager XII (sold)
1970 Yamaha 400 Enduro
1969 Kawasaki 500 Mach III
1960 Cushman Scooter
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the2knights
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Past 86 Voyager XII Honda SilverWing Honda CB900Custom Suzuki GS1000 Yamaha 80 - Location: Bloomington, IN
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Re: Spark plug change to Iridiums
I could not agree more, I put the same plugs in, as well as the NGK caps with new boots. Starts easier than ever, and throttle response did have a noticeable difference!
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Lucasind
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1988 Voyager 1200
1985 Voyager 1300
2008 Concourse 1400
1985 LTD 1100
1981 CSR 1000
1981 CSR 650
1979 KZ 650
1973 XL 350
1988 Eliminator
1975 CB 125
1965 S 65
and a bunch of parts ! - Location: Toledo, OH
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Re: Spark plug change to Iridiums
I can't agree more....I also installed Iridium plugs and a new fuel filter on the same weekend morning .then got busy doing other "weekend yard stuff" , later in the day it was time to take the XII out for a ride,half forgetting what I did earlier....I was shocked at the noticeable power difference, was almost like a different bike ! 
................tony 
................tony 90% OF ANY JOB ...IS GETTING STARTED !