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Duran Shirley
Reviewed in France on February 20, 2025
Très bien
Erik binnemans
Reviewed in Belgium on February 11, 2025
alles zoals werd beloofd. zeer tevreden.
Squire
Reviewed in the United States on September 13, 2024
I now use these in place of the OEM plugs for my 2014 HD. These work great !
Mike S.
Reviewed in Germany on December 27, 2024
Ich fahre diese Kerzen seit 2011 in meiner Road King von 2004. Noch nie Probleme gehabt. Habe sie jetzt vorsichtshalber nach 13 Jahren mal gewechselt.
Guillaume Lavoie
Reviewed in Canada on July 2, 2021
Sur mon Road King
Michael Goeringer
Reviewed in the United States on January 2, 2020
I have no issues with these plugs but note they do NOT come pre-gapped; at least for our 2011 Fat Boy the gap was not within the acceptable range of .038 to .043. The gap was much smaller. Checking is quick and easy and highly recommended.
blynch35
Reviewed in the United States on August 4, 2015
good spark plugs for a great price.
Camper Van Beethoven
Reviewed in the United States on October 17, 2015
Initially replaced all 4 plugs and it ran OK but a little rough. The roughness gradually got worse till it was a full on miss.Replaced the plug on my BMW K1200RS and now it runs perfect.Customer service refused to believe the plug is shorted despite my sending them photos that prove it.Replacement plug runs perfectly, better than new actually.The bike idles and runs smoother and seems to have more power and torque. I love it!Sent them detailed high power microscope pictures of the plug with ohm meter readings but they claim defective engine caused short yet new plug performs flawlessly. Engine has 20k miles on it and burns no oil. Scr#w them.
YM1967
Reviewed in the United States on April 5, 2015
I do my own maintenance on my old HD ultra classic. Love doing it and keep it running like new but I forget to do something important a while ago. I replaced my OEM spark plugs when the bike hit 5K miles with these NGK Iridiums. Since these are high end plugs I planned on replacing them at 10K intervals. Well, they work so well I forgot to replace them until last week. The bike is about to hit 50K miles now and it finally got a new set of NGK Iridiums. I think 45,000 miles on the same plugs pretty much proves how well they work, especially considering these were in an aircooled engine that runs very hot at times. Many stop and go traffic jams and multi-thousand mile trips. I expect to get another set when the bike hits 100K in a couple of years.
Glenn Hubner
Reviewed in the United States on August 18, 2014
After installing in my 103ci twin cam with 115K miles on the clock, I noticed quicker start & crisper throttle response. Once warmed up, took a hard ride and ping I was getting on hard acceleration was reduced quite a bit. I later ordered & installed DCPR8EIX, a one range colder plug & pinging all gone, put a few 1000 miles since & still performing well, with no signs of fouling. Will likely switch back to the hotter 7 heat range for colder weather winter riding. 2 thumbs up!
Buck Bell
Reviewed in the United States on February 18, 2014
Okay, so I was the guy who didn't want anything but genuine Harley consumables in my 03' Sporty, like many of my well-meaning riding buddies. But after dealing with fouled plugs and hard starts after a long running, not to mention multiple occasions of pulling and cleaning the carb (thinking that IT was the problem), I decided to look elsewhere (besides the dealership) for answers. Spark plugs were the first thing to look at for improving things. So far these plugs are great! I noticed right away that the motor turned over much quicker. The sound was a bit different as well. Hard to describe, but it did have a better, more explosive tone than what I'd heard for the past few thousand miles. Spark plus aren't really supposed to do that, so I'm at a pleasant loss for words right now. All I can tell you is that the cheap (not inexpensive) factory plug seems lackluster by comparison. Get this NGK Iridium plug for your Harley. You'll be so glad you did. And buy it here, from Amazon! Great price and service is just another bonus. A win-win.
D L
Reviewed in the United Kingdom on December 8, 2014
Great price and fast delivery.
James Russell
Reviewed in the United States on May 25, 2013
Install these spark plugs and you will feel immediate horsepower increase the moment you let out the clutch and the engine will come alive in all gears. You will save money in gas too. I get an increase of 2 miles per gallon with these plugs and that savings adds up quickly. I have them in my Triumph and in my Harley-Davidson. Do they last? Yes, I put 20,000 miles on them and they looked like new, put them back in and ran another 20,000 miles. They never failed, stumbled, overheated, etc. This is a really good product. The sound of the exhaust sounds more explosive using these spark plugs. Go ahead, try them and see for yourself. Power, economy and sound. What more do you want? JamesRussellPublishing.com
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