The next steps are to install the cranks, chainwheel assembly and chain. Several builders have found aligning the chain to be the most challenging part of the build. Until you get some experience with the kit, you need to assemble everything in order to look at the chain line…. Then disassemble enough to adjust the spacers in the motor mount then reassemble again.

We begin by installing the cranks. We will start with the left side. This build has a square taper bottom bracket.
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The crank arms are pressed onto the square spindle by a single bolt.
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We repeat the process for the right side. The only difference is that the freewheel and chainwheel assembly are attached to right crank arm.
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After the chainwheel assembly is installed, we will install the chain.

In these photos, the chain guard on the motor has been removed so it is easier to see. You don’t need to remove the chain guard to install the chain.

You can used a standard BXM chain available at any local bike shop. Start by wrapping the chain around the outside chain wheel and drive sprocket. Mark where to separate chain.
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I have had the best luck by keeping the chain as short as possible. A short chain makes installing the chain a bit fiddly. It helps keep the chain from falling off.

Use chain tool to split chain at the correct length.
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Use the chain tool to press out the pin.
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Leave pin extending from link.
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Reassemble the chain and use the chain tool to press pin back into position.
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Install chain on the bike. Because of the short chain I had to remove the crank and chain wheel assembly to install the chain. Use zip tie to adjust tension on the idler sprocket.
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If you have removed the chain guard, reinstall it.
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The final step is to make sure the drive sprocket and the chain wheel are inline so that the chain is straight.
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This example is straight. If it is not straight, you will have to adjust the spacers on the motor mounting bolts as necessary.
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