tottgwn
100 µW
About a month ago, I attempted to install a brand new Avid BB7 200mm disc brake on my MAC 500W rear motor. Screwing in the bolts for the rotor was extremely difficult, but I managed to eventually get it fully tightened. After calibrating the caliper I took the bike out for a spin, making sure to test the brakes on pedal power first. All seemed to be going well until I pulled the throttle... and heard an incredibly disheartening grinding sound from the motor.
After some internal inspection of the motor, I realized that the bolts that came with the rotor were longer than the threaded holes in the side cover of the motor. When I screwed in the bolts I actually punched through the metal on the other side of the side cover, introducing delicious little metal chunks for the nylon gears to gobble up, destroying several teeth.
I emailed Cell Man about my predicament and I got 3 new nylon gears with extra grease, circlips, and side cover screws for $46 after shipping, which were just delivered (after waiting two weeks) this past Saturday. I cleaned the hell out of the disassembled motor with toothbrushes, making sure all of the loose metal bits were removed, and put it all back together with the new nylon gears. I brought it outside, took an extremely nervous twist of the throttle, and it sounded good as new!
Lesson learned: Don't screw those disc brake bolts too far into the side cover!
(Also, thanks again to Paul at emissions-free for helping me get this fixed asap. His customer service is helpful and prompt, despite being on the other side of the planet!)
After some internal inspection of the motor, I realized that the bolts that came with the rotor were longer than the threaded holes in the side cover of the motor. When I screwed in the bolts I actually punched through the metal on the other side of the side cover, introducing delicious little metal chunks for the nylon gears to gobble up, destroying several teeth.
I emailed Cell Man about my predicament and I got 3 new nylon gears with extra grease, circlips, and side cover screws for $46 after shipping, which were just delivered (after waiting two weeks) this past Saturday. I cleaned the hell out of the disassembled motor with toothbrushes, making sure all of the loose metal bits were removed, and put it all back together with the new nylon gears. I brought it outside, took an extremely nervous twist of the throttle, and it sounded good as new!
Lesson learned: Don't screw those disc brake bolts too far into the side cover!
(Also, thanks again to Paul at emissions-free for helping me get this fixed asap. His customer service is helpful and prompt, despite being on the other side of the planet!)
