Yamaha wr125x iridium spark plug worth the price?

geraghty125 · Derestricted Danger Joined: 04 May 2015 Karma :

I have recently brought a 2014 yamaha wr125x and i am intending on looking after her ( i tend to brake bikes) so i want to buy nothing but the best for her but i have read alsorts of bad things about iridium over the factory copper plugs any help would be nice.
Also could you dumb it Down am not a mechanic or scientist.

arry · Super Spammer Joined: 03 Jan 2009 Karma :

Ain't worth it. Stick with coppers and change often since they're peanuts

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Yup. If your plugs are hard to get at then iridium makes sense as they (ostensibly) last longer. If you've got easy access, I'd just slap an NGK in and keep it cleaned and gapped.
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Acerman · Banned Joined: 26 May 2015 Karma :

Yepp buy it! Really good plugs and the price difference is nothing compared to what you spend on a bike in a year.

delsol · World Chat Champion Joined: 12 Apr 2011 Karma :

Iridium plugs are better by design and materials, they can cost up to 4 times the price of standard plugs. But are they worth it ?

Long life:
My worry here is that they could be installed for 10 years or more (e.g. 2500 miles per year would keep them within manufacturer's life expectancy blurb), my main concern would be 'fit & forget' and find them fubar seized when you 'have' to remove them.

Less Maintenance: Yes
Reliability: Yes
Improved Performance: Personally I cannot tell the difference.

If you are happy with the costs then go Iridium, but I would not fit and forget, ever Rolling Eyes

P. S. I do use both (not on same bike).

Acerman · Banned Joined: 26 May 2015 Karma :

Bought a 15 year old bike with original plugs on due to low mileage, no problem getting plugs off. If thats a problem you can always realese and tighten plugs once a year. Remove plugs when engine is hot!!

delsol · World Chat Champion Joined: 12 Apr 2011 Karma :

Acerman · Banned Joined: 26 May 2015 Karma :

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

Spark plug is a spark plug.

Unless you are racing in competition type events and notice that 0.001bhp or that 240,000 spark or the fact its missed 1.... then no. Copper all the time.

geraghty125 · Derestricted Danger Joined: 04 May 2015 Karma :

Thanks to you all i have made the decision to buy the iridium to try it out
Thanks again

ADSrox0r · World Chat Champion Joined: 23 Oct 2012 Karma :

You will notice a whole world of fuck all difference, other than in your wallet.
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Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Pigeon · World Chat Champion Joined: 27 Sep 2012 Karma :

Acerman · Banned Joined: 26 May 2015 Karma :

stevo as b4 · World Chat Champion Joined: 17 Jul 2003 Karma :

Possibly an advantage in a four stroke. Less so in a two stroke, where plugs are supposed to be thrown away at around 2000miles, assuming they havn't oil fouled first that is.

blurredman · World Chat Champion Joined: 18 Sep 2010 Karma :

I use an iridium on my 2t MZ, it never fouls up even if I under-gear it like crap at slower city speeds. Just gradually roll on the throttle and everything is happy. There is absolutely no performance difference, but at least when the bike stalls or w/e I can pretty much rule out spark plug foul immediately.

Not used it on a 4t, but I can imagine that I might use them if the spark plugs on a bike were particularly poor to access or the rings were particularly worn and I didn't want to open it up yet.
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CBT: 12/06/10, Theory: 22/09/10, Module 1: 09/11/10, Module 2: 19/01/11
Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S, 1979 MZ TS150.
Current: 1973 MZ ES250/2 - 18k, 1979 Suzuki TS185ER - 10k, 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (295cc) - 40k, 1989 MZ ETZ251 - 51k.

Fidge · Banned Joined: 04 Oct 2014 Karma :

they are supposed to increase fuel efficiency a tiny bit in a 2 stroke, I don't monitor my fuel enough to tell the difference.

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Fizzer Thou · World Chat Champion Joined: 06 Aug 2011 Karma :

I fitted an Iridium plug to my 450 Enduro and it did make a difference to throttle response.

But I also found that the plug specified by KTM is okay for 'normal' use but with the Iridium item I can use a decent NGK plug cap which is way better than the notoriously unreliable standard plug cap.

Two friends with KTM 525s also found that their bikes ran better with the Iridium plugs.

But on a restricted 125 I would not bother
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