[Mark in MT]

The odometer failure can be caused by several things, 1) the bushing pushing out of the side of the frame disengaging it from the magnet shaft. 2) The driving gear slipping on the shaft that drives the odometers. 3) Stripped odometer drive gear on the end of the main odometer assy. The root cause of all of these are hard turning odometers. Stewart Warner used a green grease that turns to concrete after 85+ years. The thousand row of the odometer may not have moved in several decades, now when it tries to turn 4 rows of dials, it is not up to the task. The remedy is to take it apart and clean/lube the odometer, and fix the other problems.

The calibration of the speedometer can be changed by changing the gear on the drive at the torque tube, but this will also change the calibration of the odometer. The speed and the odometer will be off in percentage the same amount in the same direction if the gear is wrong. If the odometer is right but the speed is wrong, you need to calibrate the speed portion of the unit. ( There is no internal adjustment for the odometer, it just adds up 1 mile per 1000 revs of the cable.)

PM me if you need help.