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PearTune MSO 4.0 YAMAHA

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PearTune MSO YAMAHA Still On connects to the e-bike system with compatible original connectors. No setup or diagnostics are required during installation. All configurations and adjustments to the settings of the respective e-bike are made automatically.

PearTune is wired between the speedometer sensor and the motor unit and between the display and the motor unit. The display power supply is used as the power supply. All data such as current, average and maximum speed, distance traveled, etc. remain on the display.

The only difference is that from the moment you install it, you determine how fast you go, not your bike. Top speed is limited only by pedaling frequency.

You don't need to do anything to enable the PearTune MSO feature in the Still ON variant. The device turns on (off) automatically when you turn on (turn off) your bike. This option is particularly useful for bikes without a display as there is no button to activate (deactivate) it, but it can be used just as well for bikes with a display. Accelerator pedal activity is indicated on the display by the indicator of the selected assistance level flashing.

Installation procedure - download here


① Remove the middle drive plastic cover from below. There are three Allen screws under the cover. Loosen the two bolts closer to the front wheel and tilt the motor backwards. The plugs and cables are located under the motor.

② Disconnect the four-pin connector between the display and the motor case and the three-pin connector between the speedometer sensor and the motor case.

③ Plug all four corresponding connectors on the MSO into the loose corresponding connectors on the e-bike. All connectors are provided with latches to prevent wrong connection.

④ Place the MSO in a suitable location and tape the cables if necessary. Knock the motor back into its original position and tighten the allen screws previously loosened. Next, attach the cover and the bike is ready for a test ride.

PearControl sro

Prikopy 1889

393 01 Pelhřimov


Technical parameters
Dimensions without cable: 21 x 40 x 12mm

Supply voltage range: 5 - 15 V

Maximum current draw: 100mA

Maximum power consumption: 1.5W

Weight: max. 30g

Voltage nowhere in the device, either internally or on the input/output pins, exceeds 20 V

The manufacturer reserves the right to make changes. This manual is an integral part of the device sold. The device is not a self-contained unit. By using the PearTune MSO, the user undertakes to use the modified electric bike in accordance with the applicable national legislation, including off-road, ie only on his own property or on areas designated for this purpose. The user also acknowledges that operating the bicycle outside of one's own property, even with the PearTune MSO device switched off but installed, may not comply with legal requirements. The manufacturer does not guarantee that the e-bike's warranty will not be violated or that the e-bike system cannot be damaged or disabled. The manufacturer declines all liability for any damage to health or property related to the installation or use of this device.

The manufacturer is in possession of a certificate of electromagnetic compatibility testing - compliance with EU regulations (CE marking) and a certificate of restriction of the use of hazardous substances (RoHS marking).