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Offline whyhaveone

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Spark Plug change at 15K?
« on: November 08, 2018, 04:13:26 PM »
2016SX with 15,500 miles booked in for its 15K service next week. Plugs were not changed at 7.5K as per dealer agreement.

Do I get the plugs changed? The cost would be double that of not getting them done due to tank/airfilter/etc. removal. It'll next be in for its MoT in April 2019.

It makes sense to get them done at the 26,000 valve check interval because then it's just the plug cost as an extra. So I could:
1. change them now at 15k, then at 26K.
2. leave them for now and get them changed some time next year at around 20k and leave them in at the 26K valve check.
3. change them at 26K.

Bear in mind that NGK say they are good for 80K+
"NGK Laser Iridium plugs have iridium center and a Platinum ground electrodes. If installed in a regular engine, they would likely last longer than most people keep their car (barring any motor problems that can cause premature plug death).  All Laser Iridium plugs are an OEM design, made for a specific engine.  Some feature a special resistor or electrode design, depending on the OE requirements.  In their OE application, NGK's Laser Iridium plugs typically last 80-100k miles."

 
Kawasaki: 1975 250-S1C; 1977 Z650-B1; 1980 Z1000 MKII A3; 2010 ER6n; 2013 Z1000SX ABS; 2016 Z1000SX ABS Tourer

Offline mdr1970

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Re: Spark Plug change at 15K?
« Reply #1 on: November 08, 2018, 04:48:45 PM »
I'm on my third set of plugs now, with the last ones fitted during my second valve clearance service at 47619 miles  :002:

I'll be sticking to 15-20K per change, depending on them coinciding with a service :028:
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Offline rc250yz

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Re: Spark Plug change at 15K?
« Reply #2 on: November 08, 2018, 04:54:41 PM »
I had a suzuki rm125, two stroke, and it had its own "special" spark plug.  It was the same as an ngk br8es, but it had a hand welded electrode.  The cost was $30.00, each.   You could get by on the br8es, but occasionally, an electrode would fall off and damage the piston, and cylinder.

This plug we use, in our sx's, is an off the shelf plug, meant for automobiles, and not a hand built plug. I believe this is why we have such a short "recommended" service interval.   Kawasaki made damn sure we would be changing this plug way before any issues could develop with it.


Offline maccmike

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Re: Spark Plug change at 15K?
« Reply #3 on: November 08, 2018, 05:17:02 PM »
Funnily enough on another group a couple of days ago someone was changing theirs at 11K and they didn't look very healthy. Mine have now done 15K so have just ordered some and will be changing over the winter.

Offline Dartagnan

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Re: Spark Plug change at 15K?
« Reply #4 on: November 08, 2018, 05:22:07 PM »
24k on my 2015 module on original plugs, will renew when I do valves. My zx9 did almost 90 k on 3 sets and always looked in good condition when replaced

Offline Ninjamaster

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Re: Spark Plug change at 15K?
« Reply #5 on: November 08, 2018, 05:41:42 PM »
My. Dealer wants me to do them at 7500!.says I ride. Mostly in traffic and town so can't harm. To chnage them out! Hmmm

Offline Foxy

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Re: Spark Plug change at 15K?
« Reply #6 on: November 08, 2018, 06:36:29 PM »
Changed mine at 15k. Will be changing again soon and she's now done 28k.

The way I look at it - take manufacturers 90k figure and divide by a conservative 3 (revs to 11k against car at 5 / 6) that gives 30k with plenty of safety margin  which should be easily achieved but if you're worried then half again and 15k should be safe.

Offline maccmike

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Re: Spark Plug change at 15K?
« Reply #7 on: November 08, 2018, 07:53:31 PM »
 :461: :460:

Offline KD

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Re: Spark Plug change at 15K?
« Reply #8 on: November 08, 2018, 10:04:02 PM »
The 90K is for cars ...

NGK say 20 - 30K for motorbikes.

I had to get mine changed at 7.5k service as the shop were being stubborn on the warranty etc etc ...

I did take the old ones home though to fit after the second set get to about 15k fitted (a good compromise)
Regards David.

Offline whyhaveone

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Re: Spark Plug change at 15K?
« Reply #9 on: November 08, 2018, 11:46:29 PM »
Most of my riding is longer distance stuff, no commutes which may make a difference.

Thanks for all the replies. I'm still wondering what to do.  :008:
Kawasaki: 1975 250-S1C; 1977 Z650-B1; 1980 Z1000 MKII A3; 2010 ER6n; 2013 Z1000SX ABS; 2016 Z1000SX ABS Tourer