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I have an opportunity to buy a giant etour for very little, the rack mounted battery failed. It has the yamaha mid drive, I don't know where the controller is fitted. is this as simple as replacing the giant rack mount and replacing it with a battery from YOSE power, and wiring it in, or is...

The clutch mechanism that allows the bike to freewheel, and pedal without the motor being engaged is called a sprag clutch. It's unusual for them to fail engaged, but rusting together in the engaged position would be possible. Sprag clutches looks like cartridge bearings from the outside. The...