wheel bearing modifications

On some mopeds the wheel bearing are the old cup and cone type used on bicycles. They have a tendency to go bad expecially on the drive sprocket side of rear wheels. I have access to tons of wheels where this has happened and was looking for a way to rebuild them. That seems to be the Achilles heel of a moped when striving for faster speeds. I was wondering if anyone has modified and used sealed bearings like used on motorcycles. If so, how did you do it and do you have any pictures of your modifications? I'm planning on doing this and would like some tips of what to look out for when doing this modification.

Brian

Lamborn's Miniature Engines

http://www.geocities.com/miniengine

How to remove rear sprocket

Chris Robertson /

I've got a couple of extra Peugeot and Honda rear wheels that I'd like to restore. The bearings on the rear sprockets are bad (at least I'm assuming that is the problem).

How the heck do you get the sprockets off?

Thanks for your help!

Chris.

Re: How to remove rear sprocket

I'm not sure I understand your question. Are you talking about removing the pedal sprocket on the rear wheel? If so, you need to make yourself a spanner socket to remove it. That is a rare thing to go bad. They are directional bearings that should turn in one direction but not the other. If your's does this and there isn't any play in the bearing then you don't have a bad pedal sprocket bearing.

Brian

Lamborn's Miniature Engines

http://www.geocities.com/miniengine

Re: How to remove rear sprocket

Chris Robertson /

I'm referring to the sprocket <i>on</i> the rear wheel. I have several wheels where the sprocket does not turn as freely as it should (i.e I cannot spin it like I can on "good" wheels) --I assume the problem has to do with bearings, but I can not inspect them unless I can remove the sprocket.

Chris.

Re: How to remove rear sprocket

I don

Getting my bearings

Ah Dave, now this is a interesting concept and one I would like to research more. I would be most interesed in seeing your picture. I would also like to know the bearing number also. Please email me the picture and bearing number to: miniengine@yahoo.com

If I come up with a better mouse trap I'll be sure to post the pictures on my web site for all to see. Thanks again Dave and I look forward to hearing from you.

Brian

Lamborn's Miniature Engines

http://www.geocities.com/miniengine

Re: How to remove rear sprocket

Chris,

Try soaking the bearing in paint thinner and spinning the bearing. Keep doing this and maybe the old grease and dirt will loosen up and come out of the bearing. Blow it dry with an air hose and inject some oil into the bearing. I looked at the sprocket and bearing you refer to and it looks to me that you will destroy the bearing trying to take the sprocket off. I think the sprocket is the outer race of the bearing by the way the metal seal covers right out to the sprocket edge.

Brian

Re: How to remove rear sprocket

Ron Brown /

Chris,

If you are talking about a bicycle style free-wheel, take your wheel to any bicycle repair place and either have them remove it or buy a wrench that fits.

If you decide to do the wash out and blow dry trick, do not spin the sprocket with the air blower, this will tear up your balls!

Ron

Re: How to remove rear sprocket

Hi, fellow mopeders! I spent 4hrs. today replacing the rear wheel bearings on my MOTOMARINA Sebring.Boy,were they shot! While I was at it I cleaned up the brakes and adjusted everything.It has the loose 1/4 " ball bearings and I overtightened them some so that when I test rode it I noticed about a 5 m.p.h. loss in general. I'll fix that tomorrow. I forgot to mention that I also replaced the bearing races.One ball bearing was broken neatly in half and was responsible for a 25 m.p.h. + vibration that felt like the tranny was going bad.But it's o.k. now! BYE!

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