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  • Spark plug not screwing in

    I'm hoping someone can offer me some tips here. I'm having troubles getting one of the spark plugs in my GPX to screw in. Out riding on Saturday night, it made a bit of a sudden 'pop' sound, and I lost power, and I noticed one of the plug leads was loose, with the plug just sitting in the hole. Jedi came out with some tools and we took the tank off on the side of the road, but nothing we did could make this plug screw in - we even removed the other plug as a bit of a cause-elimination exercise, but its definitely the right hand cylinder that is the problem, because both plugs screw into the left side just fine.

    I replaced the engine in my GPX about a month or two ago, and admittedly it seemed kinda loose at the time, but it worked so I thought nothing of it.

    Can anyone offer ideas or tips?

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    - Spuddy: Music, motorbike, gaming, socialising and drinking enthusiast. Man about town!
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  • #2
    I would theorise that at some stage the plug was over tightened and the thread was stripped from inside the hole. You should be able to get it rebored fairly easily.
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    • #3
      Is there any thread in the hole?

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      • #4
        If you find that it is stripped and want to fix it yourself, give me a PM and I will sort you out will a Helicoil kit to repair it with. It sounds like its stripped.

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        • #5
          I would say head would have to come off for inspection, possible thread stripped or damaged.
          There are two questions in life.
          1:Which way do I go
          2:Whats the lap record.

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          • #6
            When you say you couldnt screw the plug back in, was it just not grabbing onto the thread properly or did you feel tension when you were screwing it in and it just wouldnt get tight?

            If its the second one, then you might have a stripped plug thread. Did you use the proper spark plug socket with the rubber inside to hold the plug in it? Its easy to line up the plug that way so you dont cross thread it too.
            ZippySig.com

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            • #7
              If you don't feel up to removing the head and rethreading the plug hole yourself, speak to Gav at GD Engineering, I seem to recall him having a plug recoil kit, and I'd trust his work implicitly.

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              • #8
                So what was the pop? Compressed charge blowing past the spark pug?
                For LAMS information and resources - http://www.perthstreetbikes.com/foru...thread-156358/
                For LAMS discussion and to ask questions - http://www.perthstreetbikes.com/foru...thread-143289/

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                • #9
                  Does the plug not even start going in or does it go in and spin? If the first one I suppose you may be able to clean/tap the thread, the second one probably means the thread is stripped and the head will have to come off and and you could try a helicoil but I have red that they are not that good and sometimes come out with the plug. Timesert makes something that supposedly get around this. I hope for your sake it the first possibility.
                  -

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                  • #10
                    I had a look at a gpz1100 yesterday which had the same problem - is it much of an effort to rethread?
                    Any idea on cost if I were to out source it to someone with a bit of know how?

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                    • #11
                      That Timersert mob have kits for various size spark plugs and reckon the work can be done without taking the head off. I've never used them but they sound pretty neat. http://www.timesert.com/html/sparkplug.html
                      I'm not sure but I think I saw them at the Metric Men.
                      -

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                      • #12
                        I'd be worried about swarf down the plug hole.
                        I know there are similar kits by nutsert too, I'd be doing both threads.

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                        • #14
                          Yeah, if it was my bike I'd be worried about crap dropping in the plug hole, that's why I said the head probably would have to come off. I then saw those Timesert people reckon you can do it in place. Maybe they make sure the piston is near the top and shove a vacuum cleaner in there afterwards or something. Maybe we're over-reacting, I dropped a small nut in the carby on my car while it was idling, there were a couple of knocks and then it ran fine for years, dunno if the nut got embedded in the top of the piston or shot out the exhaust valve but gave me a fright.
                          -

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                          • #15
                            It is not grabbing at all, just spinning in the hole. I don't think its not lined up properly, the other side bites the thread straight away - although admittedly, it doesn't tighten up all the way.

                            How can I check to see if it is stripped? Even with the tank off its really hard to see down the hole, the frame is halfway in the way.
                            - Spuddy: Music, motorbike, gaming, socialising and drinking enthusiast. Man about town!
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