engine bearings source

ran49

New Member
Mar 5, 2008
186
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So.In.
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
 
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ran49

New Member
Mar 5, 2008
186
1
0
So.In.
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
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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
 

misteright1_99

New Member
Mar 21, 2008
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Treasure Coast, Florida
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....
 

Norman

LORD VADER Moderator
Jan 16, 2008
2,605
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pampa texas
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
 

Bikeguy Joe

Godfather of Motorized Bicycles
Jan 8, 2008
11,843
237
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up north now
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.