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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: neg on September 15, 2026, 04:17:09 PM
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The speed has never remained consistent on my Acewell Speedo, which makes it incredibly difficult to calibrate. When I ride, the digital speed will fluctuate between a range of values anywhere from 2 to 50+.
The faster I ride, the more the speed fluctuates, sometimes down to half the actual speed (i.e., if actual speed is 80, displayed speed fluctuates all over the place between ~40-80).
Sometimes the speed goes completely flat to zero when I downshift and coast. This happens rarely. Probably something else unrelated. Tightened the terminal bolts recently and haven't noticed that happen since.
The speedo is plugged into the BMW speed sensor. The Acewell speed sensor is not being used.
As far as I can tell, all the other electrical work I've done on the bike is sound.
Think it's a faulty speedo, ground issue (doubtful), or something else?