The scooter ignition system is designed to ignite the fuel-air mixture in the cylinders. The whole process is carried out using a spark plug. A high voltage (from 15 to 30 thousand volts) is formed in the coil. Accordingly, in the event of an ignition malfunction, adjustment should be started with these elements.
Modern scooters use non-contact ignition systems. However, the presence of a spark is not an indication that the system is working properly, since the power of the electric discharge may not be enough to ignite the mixture.
To check for spark, unscrew the spark plug and secure it to the engine ground using any suitable metal fixture. Holding a candle in your hand is extremely dangerous, since the voltage across it can reach up to 40 thousand volts.
Install a working spark plug to troubleshoot and adjust the scooter ignition system. Before starting the diagnosis, using a multimeter, make sure there is electrical contact between the engine and the scooter frame.
The most important element of the ignition system is the generator. To measure the resistance of the supply circuit of the ignition coil, disconnect the wiring from the generator, and then measure the resistance between ground and one of the wires (black wire with a red stripe). Resistance in the range of 80-150 ohms can be considered normal. If there is no resistance or the value is below the established norm, the generator is faulty.
To accurately determine the breakdown, dismantle the generator and measure the coil resistance using a multimeter. In this case, it is necessary to connect the device directly to the terminals of the coils, since one of them is soldered to the magnetic circuit. If during the measurement the resistance turned out to be normal, then the breakdown should be looked for either in the wiring or at the point of connection with the coil.
If the generator is in good working order, check the integrity of the wiring. Connect a multimeter to two points - to the terminals of the "switch - ignition coil" block and to the block connected to the generator. After checking the integrity of the wires, they should also be checked for a possible short between them. If the entire circuit from the generator to the wiring terminals to the ignition unit is intact, then the ignition unit is most likely faulty.