I have a BH Easymotion Lynx 6 which I purchased use from someone local here in Florida. Since I have owned it the bike provides very little assist when riding. Every other function on the bike seems to working just fine it’s just the level assist is very low. When I check the various sensors on the display everything seems to be reading fine except for the level of assistance. One display shows the percentage of assistance which jumps around wildly only while the motor is engaged. The behavior is erratic but constant unlike a faulty or broken wire. It seems like a sensor is bad. The other display shows the motor putting out 10% of what it is capable of. I have been trouble shooting these issues for the past couple of months and have performed the following.
- I have not seen any errors from the bike.
- Checked all the sensor readings which all seem fine except for two. Battery life is good, Cadence is good, speed is good, Wattage usage looks ok but seems low, percentage of assist jumps around, and level of assist shows around 10%.
- Started and stopped pedaling over and over to make sure the motor is engaging and disengaging correctly. Works fine.
- Changed settings such as the tire size to see if it would provide more assist which it did not.
- Adjusted the speed senor and even bypassed it which did nothing for the level of assist the motor provides.
- Opened the battery and tested it. I even bypassed the BMS on the discharge side guaranteeing the motor could pull maximum amount of power. This also had no effect on the level of assist the motor provides.
- I removed all of the covers surrounding the motor and inspected all of the wires which are not damaged. I continuity tested the wires which lead up to the controls which all checked out fine. This was to see if the controller was getting intermittent signal from the torque sensor so it may have been limiting the assist.
- I removed the motor and checked all of the connections which looked normal. The motor was sealed by Brose and hadn’t been tampered with but I could see that it had been removed before. All of the seals and connections inside the motor look fine along with the gears and belt. Mechanically the motor seems to be functioning correctly and doesn’t make any odd noises.
- I tried contacting BH and they refuse to work with me since I am not a dealer and I don't know which dealer the bike came from.
I have heard more than a few folks have issues with their torque sensors which I am thinking is one of the few things left to check. I am not sure what else could cause this issue. Has anyone else had similar issues that were resolved?