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 Post subject: Iridium Spark Plugs
PostPosted: Thu Apr 06, 2017 8:30 am 
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50 cc
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Joined: Sat Mar 11, 2017 5:16 pm
Posts: 6
Location: Heanor, Derbyshire
Hi all,

Do any of you use them, is it worth paying a few extra quid to upgrade to one and would there be any difference?

Daz


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 Post subject: Re: Iridium Spark Plugs
PostPosted: Thu Apr 06, 2017 8:34 am 
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125cc

Joined: Mon Oct 05, 2015 10:53 am
Posts: 189
I've got one...couldn't tell any difference to be honest...might last a little longer though..


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 Post subject: Re: Iridium Spark Plugs
PostPosted: Thu Apr 06, 2017 9:14 am 
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125cc
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Joined: Mon Nov 14, 2011 9:38 am
Posts: 209
There is so much marketing BS surrounding spark plugs.
If the bike has the correct plug in good condition, upgrading to anything else will make no obvious difference. Any differences are theoretical, and VERY small in practice.
An Iridium should last a lot longer than a standard plug, but in a 2 stroke will probably be fouled with deposits before it's worn out.


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 Post subject: Re: Iridium Spark Plugs
PostPosted: Thu Apr 06, 2017 10:18 am 
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300 cc
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Joined: Mon Apr 22, 2013 7:07 pm
Posts: 570
They are designed for high revving high compression race engines where the spark needs to be powerful quick and arrive critically on time. As said they are no good for 2 strokes and when a standard plug which works as it should costs £2 and an iridium one costs £10 it's really false economy for any potential minimal gain. Best practice is to use what the manufacturer recommends as far as make, grade etc as this is what their R&D department found was best suited for the engine. Plugs don't break down like they used to in the 70s and 80s when we used leaded fuels.


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 Post subject: Re: Iridium Spark Plugs
PostPosted: Thu Apr 06, 2017 4:27 pm 
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80 cc

Joined: Wed Dec 29, 2010 9:31 am
Posts: 29
My WR250F starts better in cold conditions with an Iridium plug.

I've no idea why, but there you are.

Tim


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 Post subject: Re: Iridium Spark Plugs
PostPosted: Thu Apr 06, 2017 5:39 pm 
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125cc
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Joined: Mon Dec 27, 2010 8:34 pm
Posts: 175
Location: Sunny Hudds
I found the same.
I believe they are supposed to give a stronger spark and put less load on the coil. So are better at coping with a battery that is not fully charged.

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 Post subject: Re: Iridium Spark Plugs
PostPosted: Thu Apr 06, 2017 9:35 pm 
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650 cc Monster
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Joined: Fri Dec 07, 2012 2:22 pm
Posts: 2439
Location: Romiley
Greetings,

I use NGK iridium spark plugs in all of my engines and I have never had any spark plug issues. I can't prove that they​ work any better than the standard items but in our trials bikes we never had need to remove them.

Maybe it is just what you get used to and in which you have confidence.

TTFN.

Hugh.

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Please note that I am not a National TRF Officer, any views expressed are my own and may not be in accordance with any official policy.


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 Post subject: Re: Iridium Spark Plugs
PostPosted: Fri Apr 07, 2017 9:41 am 
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200 cc
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Joined: Sun Dec 30, 2012 10:17 pm
Posts: 256
I've had a batteryless kickstart only Yamaha WR400 for over 10 years now, it came fitted with an NGK Iridium plug and I replaced it after 7 years simply as I thought it was about time I changed it, yet there was nothing wrong when I removed the old one... still have it as a spare ;)

On a bike like this the spark plug is critical for reliable starting and got to say that in all the years that I've had this bike it's been good at starting and I'm sure the Iridium plug has played a part in that.


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 Post subject: Re: Iridium Spark Plugs
PostPosted: Fri Apr 07, 2017 9:45 pm 
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80 cc

Joined: Thu Mar 11, 2010 12:03 am
Posts: 98
I found a good improvement on a 300 2t.I cant explain why but the bike is smoother with less vibes at idle.


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 Post subject: Re: Iridium Spark Plugs
PostPosted: Mon Apr 10, 2017 2:31 pm 
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300 cc
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Joined: Wed Nov 02, 2011 12:39 pm
Posts: 574
Location: Herts / Beds / Bucks
I recently fitted one in my 450EXC before racing in the Tour of Portugal, didn't notice the slightest difference!

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2006 KTM 450 Rally
2011 KTM 990 Adventure
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