Is changing the spark plugs every 7500 miles/12000 kms necessary?

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Is changing the spark plugs every 7500 miles/12000 kms necessary?

This is a discussion on Is changing the spark plugs every 7500 miles/12000 kms necessary? within the 3rd Gen Z1000/Z1000SX/Ninja 1000 forums, part of the Kawasaki Z1000, Ninja 1000, Z800, Z750 & Z-750S category; My 2011 z1000 currently has 21000kms approx 12000 miles on it, wondering if doing the plugs is necessary or will I just find them to ...

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Thread: Is changing the spark plugs every 7500 miles/12000 kms necessary?

  1. #1
    Up-And Comer NateKing's Avatar
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    Is changing the spark plugs every 7500 miles/12000 kms necessary?

    My 2011 z1000 currently has 21000kms approx 12000 miles on it, wondering if doing the plugs is necessary or will I just find them to be still good.

    What's everyone finding to be the correct interval for plug change? I've heard they use high end plugs from the factory to begin with.

    I have never done plugs before.

  2. #2
    Site Elder Johnmark101's Avatar
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    I changed my plugs at about 8500 miles and they were still in very good condition.
    Who needs a therapist when you own a motorcycle.

    2013 Ninja 1000 ABS, Ivans ECU reflash and custom map with full Akrapovic exhaust, airbox mod, block off plates, Traxxion Dynamics built suspension front and rear, Osram Raylle 65 watt headlamp bulbs, Pazzo Levers, Sargent seat, R&G engine case protectors, Vesrah brake pads, Puig screen and Ventura luggage for the occasional road trip.

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    Up-And Comer furagwa's Avatar
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    My '11 N1K is over 13k miles. It still seems to run fine. I was going to wait until at least 15K before I even think about it (unless something happens before that, of course)
    traktor_cerber likes this.

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    Supreme Being kenors's Avatar
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    I changed out the plugs on my '11 at 25k miles. I'm still have the old ones since they look barely used. The iridium plugs specified on the Ninja last forever. I use to change iridium plugs on my '98 & '99 VFRs every 32k miles. BTW, checked the valves at the same time and all were spot on. Box stock motor except for slip-ons & K&N. I also don't spend much time at redline.
    2014 Ninja w/bags, Motowerks lowered pegs, Sargent Seat, Vstream tour screen, Givi XS306 tank bag, WOLO BadBoy, Aerostitch Roadcrafter.

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    Up-And Comer NateKing's Avatar
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    Thanks for the insight guys, I don't think I'll worry about it for now, unless I end up going into the engine for another reason I think I'm going to hold off on the valve inspection and plugs until around the 24k mile mark.

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    Up-And Comer NateKing's Avatar
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    Bike is stock except for air filter and akra slip ons just like yours kenors, just street riding nothing crazy.

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    Site Elder Johnmark101's Avatar
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    Quote Originally Posted by NateKing View Post
    Thanks for the insight guys, I don't think I'll worry about it for now, unless I end up going into the engine for another reason I think I'm going to hold off on the valve inspection and plugs until around the 24k mile mark.
    Same here. From what I have read those who have performed the first valve clearance inspection at the interval suggested in the service manual find them to all be in specification. I am waiting until about 25,000 miles which I believe is what is specified for California emission bikes.
    Who needs a therapist when you own a motorcycle.

    2013 Ninja 1000 ABS, Ivans ECU reflash and custom map with full Akrapovic exhaust, airbox mod, block off plates, Traxxion Dynamics built suspension front and rear, Osram Raylle 65 watt headlamp bulbs, Pazzo Levers, Sargent seat, R&G engine case protectors, Vesrah brake pads, Puig screen and Ventura luggage for the occasional road trip.

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    Supreme Being rcannon409's Avatar
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    We had a training class, for work, and it covered a lot of preventative maintenance things.

    The instructor mentioned an oil change interval for a specific piece of equipment, and several people mentioned how early that was..."No way, the oil was good for at least twice that long" sort of talk...

    The instructor then made a really good point.

    He said, "While the oil may be good for twice that long, maybe its not under certain circumstances."

    He then said, "We gathered everyone here to talk about preventative maintenance. If we wait to work on something until its needed, its no longer preventative, is it? Thats called reactive, and we dont talk about that in this class. In fact, this class is taught to avoid having to teach that class."

    He had THE tone, so that ended the talk about extending the oil changes.
    2012 Ninja 1000 all green - Brembo 330mm rotors - AK20 fork cartridges -Penske shock-slipper -Ivans reflash...Leo Vince slip on and Arrow header

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    Up-And Comer i-man's Avatar
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    I changed mine at 9000 miles and they still looked fine. Better to change them before they "need" changing, imho.
    rcannon409 likes this.
    "A great civilization is not conquered from without, until it has destroyed itself from within." W. Durant

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    Rising Star deroz's Avatar
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    Mine were changed after about 40k miles. No issues when I changed them. So....

  12. #11
    Up-And Comer Univibe88's Avatar
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    Quote Originally Posted by NateKing View Post
    Thanks for the insight guys, I don't think I'll worry about it for now, unless I end up going into the engine for another reason I think I'm going to hold off on the valve inspection and plugs until around the 24k mile mark.
    I did my valves and plugs at 24k. Valves were all in spec. I may never touch them again.

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