Instructables

Step 9: Order the parts

At this time you should have decided on the voltage of your bike. You should have completed your parts list. Like I said earlier, some parts are designed for specific voltage. Now start your searching for the best price for the parts you need. The first thing I found was the motor I wanted on eBay. I was very lucky to find the motor with only an hour of use. When you buy used parts there is a chance the parts may not work, when buying from eBay try to buy from sellers who have sold a lot and have very high percent of positive feedback.
 
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If you add alternator to the front wheel, it could charge spare battery , hence get more running.