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Motorized Bicycle Trouble Shooting Use this area to post problems that may arise, if you could use some help in figuring out what is wrong with your bicycle motor and what needs to be done to achieve top performance.


replacing crankshaft seal

Use this area to post problems that may arise, if you could use some help in figuring out what is wrong with your bicycle motor and what needs to be done to achieve top performance.


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  #1  
Old 07-10-2013, 08:49 AM
sboricic123 sboricic123 is offline
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Default replacing crankshaft seal

Is it an easy task replacing the crankshaft seal on a China girl 66cc?
Are there things I should watch out for?
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Old 07-10-2013, 10:44 AM
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2door 2door is offline
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Default Re: replacing crankshaft seal

http://www.google.com/cse?cx=partner...eal&gsc.page=1

Lots of information on that here. Just make sure to get the magneto rotor (magnet) back on the way it came off. Good luck.

Tom
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Old 07-10-2013, 10:46 AM
crassius crassius is offline
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Default Re: replacing crankshaft seal

also, pry upwards on the ends of the crank to be sure the mains aren't loose

if loose, they need replacing as the seal won't work if the crank is moving up and down
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Old 07-26-2013, 12:40 PM
sboricic123 sboricic123 is offline
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Default Re: replacing crankshaft seal

I purchased a crankcase seal from a dealer that deals mostly with Skyhawk engines. I installed it but it doesn't seem to fit snug behind the magneto magdet. Is there a difference between the seals for each engine or could I possible have purchased the wrong seal?
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Old 07-26-2013, 12:52 PM
crassius crassius is offline
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Default Re: replacing crankshaft seal

on most engines, the clutch side seal is wider than the magneto side
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Old 07-26-2013, 10:17 PM
sboricic123 sboricic123 is offline
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Default Re: replacing crankshaft seal

This is the one I had ordered and installed. It shows This is a direct OEM replacement and will fit either a 48cc or 66cc motorized bicycle and is guaranteed to last.
Could it be the clutch side then?
http://www.motorizedbicycle.ca/crank...seal-loop.html
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Old 07-26-2013, 10:25 PM
crassius crassius is offline
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Default Re: replacing crankshaft seal

sorry, never heard of that store

no info there about the seal and I also looked at a crank bearing, but no info there either except that the pic showed some kind of sealed bearing

search around this board & you'll see a post somewhere about ordering seala as a pair
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Old 07-26-2013, 10:32 PM
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Default Re: replacing crankshaft seal

I'm not suggesting one vendor over another but just linking this page to you so you can see a comparison between the thick and thin seals. http://www.pistonbikes.com/category-s/10.htm Most of our advertisers carry these seals.
The thinner one goes behind the magneto rotor; the thicker one behind the primary gear on the right side.

Tom
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  #9  
Old 07-26-2013, 10:40 PM
sboricic123 sboricic123 is offline
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Default Re: replacing crankshaft seal

2Door. Thanks for that link. To bad they don't ship to Canada. I'll have to Google and see what other shops there are. I may check a few small engine shops in my area to see if they might have one.
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