Introduction
As with any moving part, the mid-drive motor may wear out or become defective at some point during the bike's lifespan and will need to be replaced. The instructions included in this article will teach you how to remove and install the Bafang mid-drive motor (M620) for the RX and RX Pro eBikes.
Tools Required
- Crow Bar (or any large metal rod)
- 1/4" Socket Wrench
- Hammer
- 13mm Thin-Walled Socket
- Punch Pin
- Chainring Remover Socket*
- Crank Arm Puller*
- Philips Screwdriver
- 8mm Allen Wrench
- 5mm Allen Wrench
- Pick Tool
*Rize Bikes is neither affiliated with nor receives compensation of any form from the Amazon sellers of the tools linked above. The links above are only provided as examples for the convenience of our customers. Rize Bikes shall not be held responsible if the tools linked above do not meet your expectations.
Video Instructions
Text and Photo Instructions
1. Start by removing the crank arm bolts from both sides of the bike.
2. Install the crank arm puller into one side and fully secure the puller's bolt.
3. Insert the socket screwdriver with extension from the other side until it is in contact with the crank arm puller. Tap the end of the socket screwdriver with the hammer until the opposite crank arm pops out. 
4. Once the first crank arm is removed, repeat steps 2 and 3 to remove the opposite side's crank arm.
5. Use the bicycle bottom bracket/chainring lock remover to remove the chainring lock nut by following the direction indicated in the picture below. 
6. With the lock nut removed, you can now remove the chainring and chain by sliding them off the motor.
7. Undo the 3 screws indicated in the picture below with a Philips screwdriver. 
8. Remove the cap as shown in the picture below. Use a 13mm socket wrench to undo the 3 nuts indicated in the picture below. Doing so will allow you to remove the mounting bolts in the next step. 
9. The mounting bolts are often quite tight in the frame and motor. Use your socket screwdriver with extension or a similarly-shaped tool and a hammer to remove the mounting bolts by pushing from the same side the nuts were removed in the last step.
10. Once the bolts are removed, pull the motor out of the mounting points in the frame. This will expose the different wire connections. Each connector is sized and/or orientated differently to prevent confusion. Gently disconnect the connectors and remove the motor.
12. Connect the replacement motor and insert it into the mounting points, making sure to tuck in the wires underneath so they do not become damaged. Once seated, the mounting points of the frame and motor will line up. Slide the mounting bolts through to the opposite side. Sometimes the bolts are a bit difficult to reinsert and will require gentle taps with a hammer to help them go in.
13. Once the bolts are inserted and tightened with nuts from step 8, tuck the remaining wires into the compartment as shown in the picture below. Be sure to organize the wires so that they're within the compartment before reattaching the plastic cover.
14. Reattach the non-drive side crank and pedal. Remember to bolt in the crank arm bolt to secure it. Then, install the chainring and chain and attach the chainring lock. To tighten the chainring lock you will need to use the socket wrench and apply force in the opposite direction to the other pedal. You can do so by either pushing down on both the pedal and the socket wrench or having someone assist you. This can also be done with the bike standing right way up on the ground so that you can place one foot on the pedal while tightening the ring.
15. Once the chainring lock is tightened properly, test the bike and make adjustments as necessary.
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