Re: 79 Puch 2speed

David S /
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every bike has a clutch

its a centrifugal clutch (also called a C-clutch)

the clutch is constantly spinning but when it spins at a high enough speed 2 metel plates are forced gainst a metel wall that is connected to your drive sprocket

here is a photo of one in a chain saw

http://home.howstuffworks.com/chainsaw4.htm

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