Random scratching noise inside clutch shaft

Discussion in 'Motorized Bicycle General Discussion' started by Jeco, Oct 14, 2010.

  1. Jeco

    Jeco New Member

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    Hi all,

    A couple of days ago I've noticed this random scratching noise in my HT. I tried troubleshooting, I've removed the clutch cover, clutch plate, also removed the clutch pads. While pedal testing, still the scratching noise is there.

    I've also removed the engine chain from the wheel to isolate the bike, the bike alone doesn't make the noise at all.

    I suspect there is something wrong within inside the clutch shaft( not sure if thats what you call it),
    but I don't know how to open up the thing. I've read a thread here that you just need a flat screw, wedge it between the two prongs, tried it but it keeps rolling including the wheel.

    Is there an easy way to open this clutch shaft part.

    Thanks!
     
  2. Jeco

    Jeco New Member

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    I am afraid sometime soon this will seize the motor and me flying to the gutter, I hope not with my son riding with me.

    I did some greasing on the gears and also on the top screw hole where the clutch cable stops.


    cheers!
     
  3. scotto-

    scotto- Custom 4-Stroke Bike Builder

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    There may be a critter in there....get it out as soon as possible. That should take care of the
    scratching noise....hopefully. :D
     
  4. Jeco

    Jeco New Member

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    Haha! I hope it's just a critter...parts here are expensive and hard to come by.
     
  5. BarelyAWake

    BarelyAWake New Member

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    Hmm... perhaps it's the new HP HT?

    [​IMG]

    Is so ossum the spandexers are all over it;

    [​IMG]

    :p
     
  6. Jeco

    Jeco New Member

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    ^ that's new..hamster power!!
     
  7. rohmell

    rohmell Active Member

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    My master link came off and the chain got caught up in the 10 tooth sprocket a while ago.

    It must have put some stress on the clutch bearing on the sprocket side, because now it makes the same sort of scratching sound you describe. Some of the balls must have become deformed in the race, maybe.

    I have ridden more that a 1000 miles since that happened and no problems so far.

    I used a chain breaker tool and now I run the chain with no master links, so that problem won't happen again.

    The point is, if it is a minor, occasional scratch you might not have to worry about it too much.
    If it really concerns you, just pick up a new engine lower half , or even a whole engine, and swap it out
     
  8. Jeco

    Jeco New Member

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    It's good you did not end up flying or anything.

    Yes I am worried the engine might get seized/stucked inside while riding. I'll need to find time to try opening the clutch section, find the cause and replace what needs to be.

    It's ramdom scratch but deep one I think.
     
  9. rohmell

    rohmell Active Member

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    In order to get to the clutch section, you have to disassemble the engine, and separate the halves.
    Then you need to replace the bearings (you might have to press them out of the halves) and regasket the engine halves.
    My personal preference would be to buy a replacement engine and install it, so that you can get back to the enjoyment of riding your motorized bicycle, and leave the repair for an over-the-winter repair project.
     
  10. killercanuck

    killercanuck New Member

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    Hm, on the chain side, when you pull that cover off. There's a small rod in the center of the gear with a bearing behind it. You may just need to grease that rod/bearing, when it is dry it can cause an ungodly screeching.

    Lol Barely! "Feel the heat of those tiny feet!" Scotto<- :)
     
  11. corgi1

    corgi1 New Member

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    I think the hamster sticker would be great
     
  12. Jeco

    Jeco New Member

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    it actually sound more of a knocking/crackling noise as I rode on it today. could this be the bearing?

    hamster hungry and eating up my gears?
     
  13. corgi1

    corgi1 New Member

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    It says With the clutck pucks removed there is noise while rolling the bike ,,could it be the little ball bearings behind the big gear that never get oiled on the clutch side? :confused:
    xct2
     
  14. Jeco

    Jeco New Member

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    Maybe it is, or worse - the bearing inside.
    How to grease those little bearings by the way, that might solve it. Right now I don't know how to proceed, I've only removed the pucks to see if something got caught behind them.

    Thanks!
     
  15. killercanuck

    killercanuck New Member

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    Here's an animation of the chainside cover,
    http://motorbicycling.com/f30/animated-view-motorized-bicycle-clutch-assembly-8939.html
    Three bolts hold the cover on, and you can pull the rod out with your fingers. The bearing may try to fall out, so watch for it. Slap some grease in the hole and put the rod back in. That's all there is to it.

    gl.

    edit- tip:you want your clutch in the 'engaged' position(handle out) to get the cover on without fighting it :p

    edit2- oops, for clutch side bearings you should be able to get some grease in there with it 'dis-engaged', there's a little gap.

    need coffee, sorry for mix up.
     
    #15 killercanuck, Oct 16, 2010
    Last edited: Oct 16, 2010
  16. Jeco

    Jeco New Member

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    Thanks killer...tried already pulling the clutch lever in but the only thing that moves is the center rod.
     
  17. corgi1

    corgi1 New Member

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    that is what is susposed to move,,I have nit removed the large gear that thew pucks fit in around the edge,I know it comes off ,and should be removed over a large towel so the little balbearings don't roll away and get lost,I will try to finf the imfo on a thread search at the top of the page or in sticky notes on this site
     
  18. corgi1

    corgi1 New Member

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  19. Jeco

    Jeco New Member

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    Ok, I had the kit seller take a look on my bike. He thought of replacing the clutch plate assembly that holds the pucks. But found out that the inside bearing in the clutch shaft needs replacing instead. China bearing didnt last long to think this engine is less than 2 months and very seldom used.
     
  20. corgi1

    corgi1 New Member

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    They gotta quit stamping Made in China on the inside of the races, they are susposed to be smoothe






    lol
     

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