Iridium spark plugs

Realitybites · Post by **Realitybites** » Mon Nov 10, 2014 8:16 pm

Quick question, does anyone use Iridium plugs and if so was there a big difference in either longevity, reliability or spark?

From what I can see NGK says the DPR8EIX-9 Iridium, or the DP8EA-9, just wondering if the iridium are worth it.

Cheers!

Post by **Stig** » Mon Nov 10, 2014 8:33 pm

I've not tried them in the bike but a few years back I ran a Renault 5 GT turbo on splitfire plugs. It made the car run alot smoother, improved efficiency, they lasted longer than the OEM recommended plugs and they were cheaper

faststeve · Post by **faststeve** » Mon Nov 10, 2014 10:40 pm

No difference at all, waste of cash, unless your doing massive mileages, go with NGK DP8EA 9 projected nose plugs, better running and cheap, iridium don't wear out as quick but how often do you really change plugs, ?? they will not make it faster / wheelie / sound like a moto gp bike or save fuel, in fact from experience I'm not even sure they run as well as standard in the exup,

Realitybites · Post by **Realitybites** » Tue Nov 11, 2014 12:30 am

Great! thanks, so iridium coated snake oil then.

faststeve · Post by **faststeve** » Tue Nov 11, 2014 9:38 pm

I wouldn't call them snake oil, they are good but only for long life / high mileage, it's got to be a bit of a myth that performance will be better with them, put new plugs in anything and it will obviously seem better regardless of what they are, mine has the DP8EA 9 and never have any worries at all, I

YAMAEXUP · Post by **YAMAEXUP** » Wed Nov 12, 2014 11:19 am

My NGK catalogue suggests the DR8ES-L as a standard plug, the DR8EVX as a platinum or the DR8EIX as the Iridium plug for the 89-93 Rxups. Go installing a longer reach plug & you might go hitting the piston at high engine revs.

I tried a Splitfire plug in my XR400, as recommended by the rep at a bike show...& it caused severe running problems. Since reinstalling an original spec NGK plug i've never had a problem.

But in my KTM enduro 450 i've been using an Iridium plug for a few hundred miles now & it gives better throttle response & better mileage. But then this is a competition machine & I don't mind spending a few extra spondulies.

(Got Iridium plugs in the R1 as well

)

Killawife · Post by **Killawife** » Wed Nov 12, 2014 7:37 pm

I've used iridium plugs in my YZF 750 and in a volvo I'm driving now. I've noticed no difference whatsoever compared to regular plugs. They should last at least five times longer though.

Pitbull · Post by **Pitbull** » Fri Nov 14, 2014 9:39 am

I've use them in my bike,

By what I understand they are heated better during the winter, so you don't need the choke when starting the bike in the mornings,

faststeve · Post by **faststeve** » Fri Nov 14, 2014 12:38 pm

With regard to hitting the piston with projector plugs, they don't, I belive the us spec exup use them as standard,

itsnotagenesis · Post by **itsnotagenesis** » Fri Nov 14, 2014 10:05 pm

I used them in my Exup and found that it started a lot easier with them.