New, Bad, NGK Plug.
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Thread: New, Bad, NGK Plug.

  1. #1
    Senior Member slowmod's Avatar
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    New, Bad, NGK Plug.

    one interesting sidenote encountered while figuring out that my cdi was bad, was the ol' new component you'd never suspect failing trick, in this case a new-out-of-the-box-a-month-ago ngk spark plug.

    the bike ran fine (~1/2 hour) with this plug when i froze the cdi.

    later, i was testing a ford duraspark ignition i had hooked up to the bike (fires fine but just idles, no advance, another post).

    after a while, the bike would start, and then fade. i pulled the plug out to verify fire.


    tw_plugbad1_web.jpg
    it sparked good just a couple times, then faded. i noticed some sizzling and smoke right where the post emerges from the porcelain, and up the side of the porcelain. you can see the arcing a little here. unburnt gas seams to be dampen the leakage somewhat.

    tw_plugbad2_web .jpg
    then after it had been fired a bit, dried out, and you look down the barrel - leakorama! walking right thru the sides of the porcelin. bad plug! bad. sit.


    tw_pluggood_web.jpg
    this is the two year old, tarnished ngk plug i had swapped out. happy, works fine.


    another in a long line of cautionary tales.

    -
    Last edited by slowmod; 06-29-2014 at 07:40 PM.
    B-dub likes this.

  2. #2
    rbm
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    I guess you never know... I think I may test my spares now.

  3. #3
    Senior Member frog13's Avatar
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    Every company makes a dud from time too time....it just comes at a bad time .

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  5. #4
    Senior Member Leben's Avatar
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    Thanks for taking the time to post the pictures. It is a good reminder that a new component may not always work properly. When diagnosing, I often do not give much thought to a recently replaced part going bad.
    Last edited by Leben; 06-28-2014 at 06:38 PM.

  6. #5
    Senior Member greenbomb's Avatar
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    NGK makes way too many
    Put a Champion in a jap bike


    Quote Originally Posted by frog13 View Post
    Every company makes a dud from time too time....it just comes at a bad time .
    Look at the bottom of this page under SIMILAR THREADS
    Norm in Arkansas
    2006 TW , Kick Starter , Shinko 241 front 4;00/18 ,Vesrah HD clutch springs. Carb jet Kit, Amsoil 10-40 , ALLSBALLS steering head bearings, Jimbo shield. Zeta drop -down bend handguards
    Ricochet skidplate from IMMIX RACING , BIKEMASTER Supersport mirrors XT350 fuel tank , member big foot pegs

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    Senior Member slowmod's Avatar
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    Quote Originally Posted by greenbomb View Post
    NGK makes way too many
    Put a Champion in a jap bike
    i've had really bad luck with champions.
    one would hope they have improved over the years but i avoid them.

    my first choice is bosch when available, then ngk.

    i recently had a new automotive starter solinoid stick "on". so turning off the key wouldn't stop the engine from cranking. i had to jump out, grab vice grips, open the hood, and unbolt a battery teminal to get it to stop. the motorcylist parked in the space ahead of my truck was not impressed.

    the reason i mention this is that the solinoid was "standard" brand, good name, good quality, a lot of their stuff was north american made. oh, but this solinoid was "red box" standard, which is now their economy line, not "blue box" standard , which is now suposedly the good stuff.

    which is to say brand loyalty is like the damn cape for the bull sometimes but what can you do. maybe i shoulda gone for the blue cape?

    -

  8. #7
    Senior Member greenbomb's Avatar
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    Yep , know what you mean
    Good switches have silver contacts . copper contacts under high amp loads tend to stick . A week battery compounds that . If you could have hit the solenoid with the vice grips in MOST cases would have released the contacts . Bosch is good enough for us Germans Shame that they have two different lines . Really does not cost that much more to make good stuff . But to a big shot maker a million pennies = 10 thousand dollars. still a shame what they do to the public to pay the CEO's outrageous salaries
    Look at the bottom of this page under SIMILAR THREADS
    Norm in Arkansas
    2006 TW , Kick Starter , Shinko 241 front 4;00/18 ,Vesrah HD clutch springs. Carb jet Kit, Amsoil 10-40 , ALLSBALLS steering head bearings, Jimbo shield. Zeta drop -down bend handguards
    Ricochet skidplate from IMMIX RACING , BIKEMASTER Supersport mirrors XT350 fuel tank , member big foot pegs

    Honda XR 600 , KTM 300 , BMW 1100 gs , 327 Cushman Truckster , KTM 625 SXC . Ural with sidecar

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