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Iridium Plugs - YES or NO?

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Iridium Plugs - YES or NO?

PostAuthor: All2kool » Fri Jun 27, 2014 10:06 am

What are the benefits, if any, of using a more expensive Iridium Spark Plug?
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1982 Yamaha Virago 920, 13k Miles

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1982 Yamaha Virago XV750J - Drove Off The Showroom Floor, Owned 4 Years
1982 Honda CM450E - Drove Off The Showroom Floor, Traded in for XV750J
1982 Honda Ascot VT500
1981 Kawasaki 440 LTD

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Re: Iridium Plugs - YES or NO?

PostAuthor: piotrokides » Fri Jun 27, 2014 10:18 am

All2kool wrote:What are the benefits, if any, of using a more expensive Iridium Spark Plug?

Lower chance of failure
More efficient combustion
Better throttle response
Higher MPG
These plugs live mutch longer than standard plugs
Power increase
Lower emissions
Hope this is helpful :)

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Re: Iridium Plugs - YES or NO?

PostAuthor: Jake » Fri Jun 27, 2014 12:09 pm

Tried 'em. Didn't perform better than Auto Lite AP63 for me.
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Re: Iridium Plugs - YES or NO?

PostAuthor: DarkHart07 » Fri Jun 27, 2014 12:29 pm

While most of the things listed by piotrokides may be true to some extent, I doubt you'd really notice much of a difference. I've tried them and they didn't seem any different whatsoever to me than the Autolites I'm running as Jake has said already. In fact, I've had one out of two that prematurely failed on me for whatever reason.
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Re: Iridium Plugs - YES or NO?

PostAuthor: choppin » Fri Jun 27, 2014 12:33 pm

I'm running the AP63's in both of my bikes and I'm happy with the performance and the price.
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Re: Iridium Plugs - YES or NO?

PostAuthor: All2kool » Fri Jun 27, 2014 12:44 pm

So I gather that an Iridium Spark Plug in a motorcycle is of no real benefit.

Are we (XV920 owners) better off with an Autolite AP63 or the standard NGK BPR7ES?
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1982 Yamaha Virago 920, 13k Miles

Previous:
1982 Yamaha Virago XV750J - Sold 6/5/14 for $1800, Owned for 2.5 Years
1982 Yamaha Virago XV750J - Drove Off The Showroom Floor, Owned 4 Years
1982 Honda CM450E - Drove Off The Showroom Floor, Traded in for XV750J
1982 Honda Ascot VT500
1981 Kawasaki 440 LTD

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Re: Iridium Plugs - YES or NO?

PostAuthor: Marvelicious » Fri Jun 27, 2014 12:58 pm

The general consensus on here is that the AP63 is better. It is my opinion that the BP7ES and/or BPR7ES are too cold a plug for the bike in moderate climates. The AP63 is closer to a BP6ES in practice. Hotter plug avoids the fouling issues
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Re: Iridium Plugs - YES or NO?

PostAuthor: tomprobkins » Fri Jun 27, 2014 1:14 pm

The AP63 is a platinum plug at almost a standard price, I think mine were $3.00 each, while the Iradiums are $8.00 a piece. You may notice longer life with the Iradiums over platnium in the long run, and certainly over the standard NGKs short term, but probably the AP63s and the Iradiums will outlast the bike or get fouled out anyway.
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Re: Iridium Plugs - YES or NO?

PostAuthor: piotrokides » Fri Jun 27, 2014 2:12 pm

Yeah the power only goes up by max 1-3%, but iridium plugs have a very long life.
They may be more expensive but will last longer.

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Re: Iridium Plugs - YES or NO?

PostAuthor: billygee » Mon Sep 08, 2014 10:12 am

Tried the NGK Iridiums on my '96 XV1100 and the bike ran like crap for a month. Always had to cold start with the choke and after it warmed up, it would miss now and then while riding. After about a month, the rear plug simply died for some reason. Ran ok when I parked it for the night but the next morning only started and ran on the front cylinder. Traced it to a dead plug.

Went back to the NGK BPR7ES copper tips and bike was happy as a clam. Would always cold start without needing the choke and never missed a beat. Just had a day-long 400km trip on the country roads along the lake and I never felt it skip like it wold with the Iridiums. Go figure.

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Re: Iridium Plugs - YES or NO?

PostAuthor: geo » Sat Feb 21, 2015 6:45 pm

iridium in my 920 for well over 6 years now. used to have to change plugs almost every year before that. starts easier and runs smoother.think i might change them because of mileage or years of service then think, quick starts still,even power = dont mess it up, leave it alone!
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Re: Iridium Plugs - YES or NO?

PostAuthor: bstig60 » Sat Feb 21, 2015 7:39 pm

I have run the iridiums and they aren't work the extra price. I am going on the 4th year now with AP63's (same plugs) without any problems. I have a set of iridiums setting in their packages after I removed them.
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Re: Iridium Plugs - YES or NO?

PostAuthor: pud1952 » Thu May 18, 2017 10:17 am

HI chaps, I know that this is an old topic but I am going to sit on the fence with this one, I have two maxi scooters that have Iridium plugs fitted and I must say that I am very pleased with them, they start very easily, idle and run very well and I think they are superior to the standard plugs. I have not noticed any improvement in fuel consumption but I think that they run better with them in. But on the other hand I fitted them in my 81 750 Virago last year and had problems with fuel consumption and miss firing on the rear cylinder. after a short time I checked compression on both cylinders (ok), changed HT cable and suppressor caps to both plugs and replaced the rear plug for another Iridium. This year I have replaced the battery and now it starts easily and runs smoothly but I have hardly rode it at all this year so I cannot tell if every thing is OK or I just had a bad plug in the first place but it does seem to run quite smoothly now. On the off chance that there is a problem with this type of plug being fitted to the rear cylinder I will carry a spare standard plug and change it if req'd. I will keep you informed if this problem occurs again as and when I use the bike more often. Pud.

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