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#4507527 - 09/04/17 07:30 PM Spark plugs for the motorcycle?
maverickfhs Offline


Registered: 12/28/16
Posts: 1763
Loc: VA
I am planning to replace the spark plugs on my motorcycle, because they seem to be gone:





Do they tell anything about health of the engine? Also, should I go Iridium or double iridium?

It's for regular street riding. Thanks for the advice and suggestions thumbsup
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#4507532 - 09/04/17 07:36 PM Re: Spark plugs for the motorcycle? [Re: maverickfhs]
rsylvstr Offline


Registered: 01/01/07
Posts: 2493
Loc: Oneida County, NY
Standard NGK is my preference
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#4507548 - 09/04/17 07:47 PM Re: Spark plugs for the motorcycle? [Re: maverickfhs]
bioburner Offline


Registered: 09/19/16
Posts: 1418
Loc: Minnesota
Get a new set of plugs with the correct gap and then see what the plugs look like after a few days riding to see if you may need a different heat range and if the engine has any issues. The present one looks a little on the cold side but if not ridden a lot lately hard to judge.
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#4507553 - 09/04/17 07:56 PM Re: Spark plugs for the motorcycle? [Re: maverickfhs]
danez_yoda Offline


Registered: 07/18/09
Posts: 407
Loc: texas

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#4507556 - 09/04/17 08:00 PM Re: Spark plugs for the motorcycle? [Re: maverickfhs]
bioburner Offline


Registered: 09/19/16
Posts: 1418
Loc: Minnesota
Nice link danez
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#4507588 - 09/04/17 08:17 PM Re: Spark plugs for the motorcycle? [Re: maverickfhs]
JimPghPA Offline


Registered: 08/22/09
Posts: 3824
Loc: Pittsburgh,PA U.S.A.
Those plugs look fouled. Iridium plugs tend to resist fouling. If it were mine I would change to one grade hotter and go with iridium or double iridium.

I had a 175 2 cycle that we use to run mixed gas. It would foul the plug in only a couple of days of riding. After a couple of years of replacing plugs I put an iridium plug in it and it never fouled that plug. That plug was still in it when I sold it years later.
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#4507591 - 09/04/17 08:24 PM Re: Spark plugs for the motorcycle? [Re: maverickfhs]
Superflan Offline


Registered: 04/28/15
Posts: 335
Loc: Reunion Island
I go with either OEM fit (NGK or Denso), or switch to Denso Iridium Power on all my bikes, feeling the performance difference on the small engines ones.
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#4507597 - 09/04/17 08:32 PM Re: Spark plugs for the motorcycle? [Re: bioburner]
maverickfhs Offline


Registered: 12/28/16
Posts: 1763
Loc: VA
Originally Posted By: bioburner
Get a new set of plugs with the correct gap and then see what the plugs look like after a few days riding to see if you may need a different heat range and if the engine has any issues. The present one looks a little on the cold side but if not ridden a lot lately hard to judge.


Yes, bike has been sitting for a bit and I would say last time it was rode probably, a few months ago!
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#4507598 - 09/04/17 08:33 PM Re: Spark plugs for the motorcycle? [Re: maverickfhs]
maverickfhs Offline


Registered: 12/28/16
Posts: 1763
Loc: VA
I am definitely leaning towards Iridium ones, double Iridium maybe too expensive!

Does anyone has an AAP code?
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#4507622 - 09/04/17 08:58 PM Re: Spark plugs for the motorcycle? [Re: rsylvstr]
FZ1 Offline


Registered: 02/07/08
Posts: 4727
Loc: Texas
Originally Posted By: rsylvstr
Standard NGK is my preference
This ^^^^

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#4507623 - 09/04/17 08:59 PM Re: Spark plugs for the motorcycle? [Re: FZ1]
maverickfhs Offline


Registered: 12/28/16
Posts: 1763
Loc: VA
Originally Posted By: FZ1
Originally Posted By: rsylvstr
Standard NGK is my preference
This ^^^^



You don't even prefer Iridium ones? Because FZ1's love to be ridden and can do many many miles! smile
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#4507676 - 09/04/17 10:00 PM Re: Spark plugs for the motorcycle? [Re: maverickfhs]
CCI Offline


Registered: 07/15/09
Posts: 125
Loc: New Mexico USA
You're right, those plugs are done. If you are riding fairly gently, no long stretches at high speeds, no extreme temperatures, no heavy loads, then the color on those plugs doesn't look that bad at all. It's important to remember that as they wear (and those are worn), then the quality of the spark and the quality of the ignition sequence as it relates to the function of the plug changes a little bit, too.

Yes, plug condition tells much about engine health, I'd say yours is pretty good, although I might change plugs a little more often. It's helpful to know how you're riding, if this is gentle riding around town, the ignition timing, fuel/air mixture, and engine condition appear to be normal. If this was removed immediately after a few miles at highway speeds, I'd say change your air filter, too, and check it again.

Go with any plug that interests you and check it after a few hundred miles, see how it looks.

Most importantly, pay attention to how you gap the plug. It's best to use the special tool for setting the gap, it bends the ground electrode without touching the center electrode. Don't attempt to set the gap by inserting anything between the center electrode and the ground electrode and prying, you can do a lot of damage to the plug and possibly your engine.

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#4507722 - 09/04/17 11:10 PM Re: Spark plugs for the motorcycle? [Re: maverickfhs]
justintendo Offline


Registered: 03/04/17
Posts: 99
Loc: northwest pa
ngk or denso are my choices always...exotic metals are mainly for longer life to resist erosion.
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#4507735 - 09/05/17 12:27 AM Re: Spark plugs for the motorcycle? [Re: maverickfhs]
02SE Offline


Registered: 12/30/05
Posts: 2558
Loc: The Canyons
If it were me, I'd install NGK CR9EIX.

I'm running the same plugs in my heavily modified bike. They fire reliably, even at the very high cylinder pressures in my application.


Edited by 02SE (09/05/17 12:31 AM)

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#4507774 - 09/05/17 05:31 AM Re: Spark plugs for the motorcycle? [Re: maverickfhs]
Trav Offline


Registered: 11/20/06
Posts: 18236
Loc: MA, Mittelfranken.de
If the bike has 2 coils with 2 wires on each coil double platinum or iridiums are a must, its a waste spark ignition.
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