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Help Sparkplug stripped

Discussion in 'Maintenance' started by racer7, Jun 30, 2019.

  1. racer7

    racer7 Active Member

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    Hi. Just bought a Trackday dunger MC19. Won;t start, so out with old plugs for a start! New plugs in, except #3, won't tighten. Borescope used, and yep, stripped! Can this be successfully Helicoiled? If not, I would love a complete head if someone has on lying around.
     
  2. jimv50

    jimv50 Active Member

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    Helicoils if you never want to take the new spark plug out again, leave for the next guy, who will probably hate you for it.
    Time serts if you will want to replace the plug every so often or take it to a shop that can do it for you easier, quicker and with less chance of you needing this book................. ladybird book.jpeg
     
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  3. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Ha ha ha. :thumb_ups:
    Use the insert. Put plenty of sticky grease on the tap as you thread for the insert to collect all the chips/shavings, clean up and screw in insert. Fit new plug (with some copper paste on threads) and ride away.
     
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  4. racer7

    racer7 Active Member

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    The shop has it. They're fitting a heli-coil. But I was told it would cause detonation? Simple fix is I need a MC19 head if someone has one?
     
  5. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Could have it welded, then drilled and tapped if needed
     
  6. racer7

    racer7 Active Member

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    A fellow racer has come to my rescue! Thanks Ashley :thumb_ups:
     
  7. risky

    risky risky

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    time sert better than helicoil and will be durable.save cost of replacing the head.
     
  8. racer7

    racer7 Active Member

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    Thanks for that. What is a time sert? Something I've never heard of :)
     
  9. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Timesert's are solid 1 piece internal/external thread's with a flange at the top to limit how far it can screw in and are a permanent fix, v's a helicoil which is a spring type insert and can sometime's come out
    The Timesert is around 3 to 4 time's the price of a Helicoil
    teaser.jpg


    When the shop said the Helicoil could cause detonation, i reckon that they may be thinking the Helicoil will be hotter than the alloy head which it is threaded into, and will retain the heat a bit longer than the head
    I don't think it will be a problem personally, but just keep an ear out for any pinging just in case.
     
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  10. Andych

    Andych Well-Known Member Premium Member

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    Timeserts are also steel.. where Helicoils are mostly Stainless steel. Either way make sure anti-seize is used in future and dont over tighten them.. very common problems.
     
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