engine bearings source

Discussion in 'Motorized Bicycle General Discussion' started by ran49, Jun 30, 2008.

  1. ran49

    ran49 New Member

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    I managed to break my 70cc boy go fast down except for taking the crank apart.Looks like it wasn't meant to be taken apart.the large lower pin holding the two halves of the crank together with the roller bearing in the center almost look brazed on.Anyway I plan on replacing the outside crank and jack shaft bearings
    On my motor they are both 15mm bore 35mm O.D. and 11mm thick.The jack shaft bearing are sealed and the crank bearings are open.both are marked 6202.Any good source to purchase these.Ron
     
    #1 ran49, Jun 30, 2008
    Last edited: Jun 30, 2008
  2. misteright1_99

    misteright1_99 New Member

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  3. wildemere

    wildemere New Member

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    Take a sample to a bearing shop?

    Popular Metric Bearings

    They are available in open shielded and sealed.

    Make sure you get the same type.
     
  4. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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  5. ran49

    ran49 New Member

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    Thanks for the links guys.
    I did read Norman's tear down thread or I probably would never have got it apart.there seems to be a lot of slop in my lower bearing and while I'm in there I would like to replace it.I noticed Norman seemed to leave it alone and that worries me.I have found in the past that just because I can take something apart doesn't mean I can get it back together.Here's a pic [​IMG][/IMG]
    You can see the heat discoloration.I'm guessing they heated the wheel to ease installing the shaft?Anyway anyone ever take this thing apart.Ron
     
  6. misteright1_99

    misteright1_99 New Member

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    I'm glad Normans post helped. He has alot of good information, along with pictures, an awesome member for sure. I have seen things like that, they heat up one part and cool the other, then when they are together it is like they are pressed together. I would PM him and ask him, cant hurt.......

    George....
     
  7. Norman

    Norman LORD VADER Moderator
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    I stoped short of takeing the crank apart as I would have to tear up the main bearing to get the crank apart, I think your right on heating up the flywheel and cooling the crank pin. Another problem is getting it trued up after it together so I left it the way it was.
    Norman
     
  8. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Getting it trued up may be easy...if any does tear it apart here's how to "align" a pressed up crank pin.

    SERIOUSLY- If you need to align the two flywheels, use a hammer. If you need to true them up for run out, use a hammer and a hardwood wedge.

    If anyone is interested in more on this, look it up in the Harley Davison shop manuals.
     

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