SparkShift

1. Hardware overview

SparkShift is a programmable ignition ECU for 2 stroke engines. The firmware measures the pickup signal, calculates RPM, looks up the ignition angle from the map and generates the output pulse with timer precision.

2. Wiring

Follow the labels printed on the ECU enclosure. Wire colors and signal names can vary between engines, so verify the function of each wire with the bike wiring diagram before connecting it to SparkShift.

BAT-, PVL GND, COIL GND, White IN and White OUT are all internally connected with eachother but have different roles, please do not swap the wirings or it will affect electromagnetic integrity of the ECU due to bad return currents.

3. First power-up

1. Disconnect the ignition coil output or remove the spark plug and ground it safely.
2. If you are not powering the ECU from an external 12V supply, check that the ECU green LED powers up when trying to start the engine.
3. If the red LED doesn't blink, turn counter-clockwise the trimmer of the used input interface until it works, left for standard Red-White-Green Piaggio stators or right trimmer for PVL/Selettra stators.
4. Reconnect the ignition coil output or spark plug and start the engine at low RPM.
5. If the input signal is noisy, turn clockwise the trimmer until the engine turns off, then go back by 1-2 turns to make it start again.
6. Open the Android Bluetooth settings and pair with SparkShift using PIN 0000.
7. Open the dedicated app, selected your SparkShift device from the list and use PIN 0000 to connect, unless you already changed it.
8. Enjoy.

After connection, the app should show connected state, firmware version and runtime telemetry. If the engine doesn't start, check the pickup input wiring and signal polarity first.

4. App setup

The Android app is the normal configuration interface. Download it from the app page, pair the ECU over Bluetooth, then connect from inside the app.

5. Ignition map setup

The ignition map is a list of RPM and angle points. The ECU interpolates between points, so the curve changes smoothly as RPM changes.

Start with a conservative map. Make small changes, test under controlled conditions and save known-good maps as separate presets.

• Use lower advance while validating the installation.
• Do not copy timing values from a different engine without verification.
• Use the global angle offset only for small whole-map corrections.
• If the engine produces two pickup events per revolution, enable double-spark RPM correction.

6. Launch control

Launch control uses the ECU IMU. When RPM first rises above the configured launch minimum RPM, SparkShift samples the current bike angle as the start reference. The configured wheelie angle is then relative to that start position, so uphill or downhill roads do not shift the limit.

1. Mount the ECU firmly so it cannot move relative to the bike.
2. Select the IMU axis that matches your mounting orientation.
3. Use axis inversion if the angle moves in the wrong direction.
4. Set a conservative maximum launch angle.
5. Increase PID gains gradually only after basic behavior is correct.

When RPM drops below the launch minimum RPM, the reference angle resets. The next acceleration samples a new start angle.

7. Presets and security

SparkShift stores 8 complete presets in external flash. Use presets for different engines, tracks, fuel, exhaust setups or test maps.

• Load: applies a stored preset immediately.
• Save: writes the current setup into the selected preset slot.
• Name: give each preset a clear name before testing.
• PIN: writable settings require the interface to be unlocked.

Keep at least one conservative preset available so you can quickly return to a safe baseline.

8. Troubleshooting