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There are four main pieces of information we will need to determine a part number for your Motovario gearbox.
1) Case Size
- Finding the CENTER DISTANCE.
- Take the measurement of the distance between the center of the input bore and the center of the output, this is your center distance.
2) Input Measurements
- Measure the outer diameter of the INPUT FLANGE. Please do not measure bolt holes.
- Measure the inner diameter of the INPUT BORE. Please do not include the keyway.
- **These measurements can either be Imperial or Metric, please take both measurements.
3) Ratio
- The RATIO can be found on the unit’s name plate.
- If your unit is missing the nameplate, you can still find the ratio.
- On the output bore, mark where the key way is currently.
- Now take the input bore and spin this however many times it takes for the output key way to move 1/4th the way around the circle. Make sure to count how many times you spin the input bore.
- Take the number of spins from above and multiply that by four. This should be a fairly accurate number.
4) Output Measurement
- Measure the inner diameter of the OUTPUT BORE. Please do not include the keyway.
- **These measurements can either be Imperial or Metric, please take both measurements.