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Any real advantage of Iridium plugs in motorcycle? #4676787
02/24/18 05:46 PM
02/24/18 05:46 PM
Joined: Mar 2008
Posts: 6,136
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 6,136
Michigan
Iridium plugs can make sense in a car with hard to reach plugs and rack up lots of miles. But do they really make sense in a motorcycle that gets a few thousand miles a year and aren't hard to change?


2003 Mercury Grand Marquis. PP HM 5w-30 and Fram Ultra
2008 Sebring Hardtop convertible. PP HM 5w-30 and Fram Ultra
2006 Kawasaki Vulcan 900 LT. Motul 7100 10w-40 and K&N
Re: Any real advantage of Iridium plugs in motorcycle? [Re: ZZman] #4676792
02/24/18 05:50 PM
02/24/18 05:50 PM
Joined: Feb 2009
Posts: 1,585
wv
krismoriah72 Offline
krismoriah72  Offline
Joined: Feb 2009
Posts: 1,585
wv
My CRF450 had factory iridium plugs.

I would say high rpm bikes would benefit.

Re: Any real advantage of Iridium plugs in motorcycle? [Re: ZZman] #4676830
02/24/18 06:31 PM
02/24/18 06:31 PM
Joined: Nov 2006
Posts: 20,590
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,590
MA, Mittelfranken.de
Iridium and platinum require less voltage to fire, at high RPM this may make a difference in reducing the possibility of a misfire.


ASE L1, Master. Deutsch Meisterbrief.
Re: Any real advantage of Iridium plugs in motorcycle? [Re: ZZman] #4676940
02/24/18 08:16 PM
02/24/18 08:16 PM
Joined: Jan 2006
Posts: 1,064
Ruidoso, NM USA
ammolab Offline
ammolab  Offline
Joined: Jan 2006
Posts: 1,064
Ruidoso, NM USA
Some bikes fire the plugs on every stroke (wasted spark) plugs wear out twice as fast. Iridiums in the Wife's Nija 250
Are holding up well.


2009 Honda CR-V
2011 BMW R1200R
2005 Kaw Ninja 250
1994 Jeep Wrangler 2.5L
2016 Chevy SS Sport Sedan
Re: Any real advantage of Iridium plugs in motorcycle? [Re: ammolab] #4676971
02/24/18 08:55 PM
02/24/18 08:55 PM
Joined: Nov 2006
Posts: 20,590
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,590
MA, Mittelfranken.de
Good point, many bikes use waste spark ignition (2 plug wires per coil) and double precious metal plugs will last much longer.


ASE L1, Master. Deutsch Meisterbrief.
Re: Any real advantage of Iridium plugs in motorcycle? [Re: ZZman] #4677120
02/24/18 11:15 PM
02/24/18 11:15 PM
Joined: Sep 2015
Posts: 6,080
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,080
Kalifornia Kollective
Sure they do. Iridium are usually fine wire plugs. With small electrode area at the tip they concentrate the ionization charge and make it easier to fire. So you can usually open them up at least 0.005 over standard plugs w/o adding any load to the coils. Bigger spark gap is better ignition when it goes off smile

Last edited by BrocLuno; 02/24/18 11:16 PM.

Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Any real advantage of Iridium plugs in motorcycle? [Re: ZZman] #4677151
02/25/18 12:09 AM
02/25/18 12:09 AM
Joined: May 2006
Posts: 4,045
Central Wisconsin
dwendt44 Offline
dwendt44  Offline
Joined: May 2006
Posts: 4,045
Central Wisconsin
Even some autos are now using wasted spark ignitions.


There's no such thing as:
Too big of a battery,
Too large of a gas tank,
or too loud of a horn,
or too bright headlights.
Re: Any real advantage of Iridium plugs in motorcycle? [Re: ZZman] #4677153
02/25/18 12:11 AM
02/25/18 12:11 AM
Joined: May 2006
Posts: 4,045
Central Wisconsin
dwendt44 Offline
dwendt44  Offline
Joined: May 2006
Posts: 4,045
Central Wisconsin
Iridium plugs will last a lot longer in cycles just like
in cars and trucks.
Honda originally called for plug changes at 8000 miles=
ridiculous.


There's no such thing as:
Too big of a battery,
Too large of a gas tank,
or too loud of a horn,
or too bright headlights.
Re: Any real advantage of Iridium plugs in motorcycle? [Re: dwendt44] #4677200
02/25/18 03:30 AM
02/25/18 03:30 AM
Joined: Nov 2006
Posts: 20,590
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,590
MA, Mittelfranken.de
Originally Posted By: dwendt44
Even some autos are now using wasted spark ignitions.


For over 30 years now.


ASE L1, Master. Deutsch Meisterbrief.
Re: Any real advantage of Iridium plugs in motorcycle? [Re: ZZman] #4677519
02/25/18 10:48 AM
02/25/18 10:48 AM
Joined: Jul 2012
Posts: 2,568
South Carolina
alarmguy Offline
alarmguy  Offline
Joined: Jul 2012
Posts: 2,568
South Carolina
Originally Posted By: ZZman
Iridium plugs can make sense in a car with hard to reach plugs and rack up lots of miles. But do they really make sense in a motorcycle that gets a few thousand miles a year and aren't hard to change?


No


14 Road King (current)
08 VStar 1300 Tourer
07 Suzuki C50
Re: Any real advantage of Iridium plugs in motorcycle? [Re: ZZman] #4677625
02/25/18 12:13 PM
02/25/18 12:13 PM
Joined: Aug 2005
Posts: 7,215
Leamington, ON, Canada ..... r...
Papa Bear Offline
Papa Bear  Offline
Joined: Aug 2005
Posts: 7,215
Leamington, ON, Canada ..... r...
I can change the plug on my 150 in a minute .. it's FUN.
My 650 savage requires seat/tank removal plus other work to get to the plug ... NOT FUN.

150 gets cheap plug - 650 gets Iridium thumbsup


2016 Dodge GC Deep Cherry 5W-30 Dino
2013 SYM Wolf Classic 150 T4 15W-40
2009 V-Star 250 Black Cherry 20W-50 Dino
https://www.hogsforhospice.com/
Friend of Bill W. since '89

Re: Any real advantage of Iridium plugs in motorcycle? [Re: ZZman] #4678040
02/25/18 07:13 PM
02/25/18 07:13 PM
Joined: Feb 2005
Posts: 1,786
Arizona
bulwnkl Offline
bulwnkl  Offline
Joined: Feb 2005
Posts: 1,786
Arizona
My 2013 Honda pickup came from the factory with double-iridium plugs, and they specify them for replacement _just_ after the emissions performance requirement ends.

My 2012 Honda motorcycle came from the factory with double-iridium plugs, and they specify them for replacement _just_ after the emissions performance requirement ends.

Perhaps this is _only_ coincidence?


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