Cebtrifugal clutch users

Discussion in '2 Stroke Bicycle Engines & Kits' started by ninjaplatypus42, Jan 3, 2017.

  1. ninjaplatypus42

    ninjaplatypus42 New Member

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    I just finished installing a C clutch with a shift kit and everything is working fine. But it is extremely hard to turn the engine over. I have to stand and jump on the pedal to even get it turning and even then the clutch slips after half a turn. I don't even have the carb or exhaust attached yet so I'd think it would be extremely easy to turn. Is this normal? I'm thinking about just getting a pull start if it is. Thanks for any help.
     
    #1 ninjaplatypus42, Jan 3, 2017
    Last edited: Jan 3, 2017
  2. TheNecromancer13

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    You can't bump start a normal cent clutch, you need a pull start.
     
  3. ninjaplatypus42

    ninjaplatypus42 New Member

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    You can; it has a one way bearing.
     
  4. TheNecromancer13

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    I have never seen a cent clutch that only spins one way, what clutch are you using?
     
  5. ultralight01

    ultralight01 New Member

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    There is no centrifugal clutch I know of that uses a one way bearing. In order to kick start it with a shift kit.... well, you couldn't. So whatever clutch you have that has a one way bearing, that must not engage by only the bell spinning, or it may take a lot of rpm for it to happen.
     
  6. ninjaplatypus42

    ninjaplatypus42 New Member

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    The bearing that connect the clutch bell to the shaft is one way. As far as i know they're all one way. I can spin the output (left) side sprocket with a tool and turn the engine over. Go to 19:00 on this video you'll see what i mean. https://www.youtube.com/watch?v=r2QfzxIEm_Q
     
  7. TheNecromancer13

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    I'm not watching that whole 24 minute video to find when he spins the sprocket.
     
  8. ninjaplatypus42

    ninjaplatypus42 New Member

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    as i said, go to 19:00
     
  9. TheNecromancer13

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    idk how I missed that lol
     
  10. ninjaplatypus42

    ninjaplatypus42 New Member

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    No worries lol
     
  11. dogcatcher

    dogcatcher Member

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    These threads on centrifugal clutches have been an education for me. I don't ever remember seeing this many choices and configurations in the 1950's and 60's.
     
  12. Agreen

    Agreen Member

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    Sounds like the cover may be binding on the gears. Take it back apart and see if you can reassemble it without the clutch covers.

    Also, you may have run in to the same problem everyone has. The centrifugal clutch cover is too thin and needs to be spaced out. I didn't open your YouTube video, but it's probably the aussie that wants you to use 5 or 6 gaskets. Did you have to do that?
     
  13. cannonball2

    cannonball2 Active Member

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    Agreen is right try it with the covers off.

    The CG auto clutches do have a one way so you can pedal start. You have two clutches. Manual and auto. I ran one on a build and really liked it.
    Start it with the manual clutch auto it after that.

    Don't know about starting a shifter bike but it would make shifting easier just by letting off the throttle.
     
    #13 cannonball2, Jan 4, 2017
    Last edited: Jan 4, 2017
  14. ninjaplatypus42

    ninjaplatypus42 New Member

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    I tried it without the cover an it seems a little easier but i still have to jump on the pedal to turn it. I'm goint to take the whole cluch apart and make sure everything's okay and try it again.
     
  15. ninjaplatypus42

    ninjaplatypus42 New Member

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    Everything is fine with the clutch and it is turning over (sort of) now. There wass a little scraping of the clutch bell on the cover so i just filed it down maybe half a mil and it's fine now. Looking through the ratios from the pedals to the clutch it does make sense that it would e hard to turn. I'm just going to get a pull start for ease of use.

    Agreen to answer your question yes it is that video and no i just used the two that came with it. From what i understand the guy in the video did that solely so he could get a WD-40 straw into the gears because he was having issues with lubrucation. I decided against it because i think most of his lubrication issues stem from the fact that he's using WD-40, a degreaser, on greased parts.
     
  16. Agreen

    Agreen Member

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    You're absolutely right. It's foolish to try to pass wd-40 as an appropriate clutch lubricant.

    Try this. Pop the spark plug out, then pull the magneto cover. At this point, you should be able to turn the engine over with your fingers.

    Also, see if any of my efforts and lessons learned from this thread help:
    http://motorbicycling.com/showthread.php?t=60645
     
  17. ninjaplatypus42

    ninjaplatypus42 New Member

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    Ill try that tomorrow morning. There's no carb or exhaust on it yet but i guess the spark plug would still make a seal when it's in the top of the cylinder.
     
  18. cannonball2

    cannonball2 Active Member

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    Some of these kits ran oil in the case for the clutch. Mine had the plug. So I tried it. I guess the clutch had the wrong friction material as it slipped too much. Sure was nice having the gears in an oil bath as well as the clutch parts.
    My BT80 was designed to run oil in the clutch which is basically the same type. I am running 80-90wt with no problems.
     

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