How to set the ignition on a 4t scooter? Principle of operation, causes of malfunction and setting

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42

How to set the ignition on a 4t scooter? Problems with the ignition of a 4-stroke engine can appear for various reasons, but they all lead to the same result - the engine stops starting. But the lack of a well-timed spark may not be the only reason an engine won't start. To make sure that it is the ignition that is the cause of the engine failure, it is necessary to check all other possible malfunctions that may interfere with the operation of the engine, and eliminate them. Breakdowns can occur in the ignition system, the causes of which can arise from both the mechanics and the electric side. With the help of simple tricks, you can determine whether the problem is a mechanical malfunction, or an electrical component is to blame. At home, you can fix any breakdown in the ignition system of a 4-stroke scooter engine.

Causes of 4-stroke scooter engine failure

If the scooter engine does not start, the reasons can be very different:

1. No fuel supply to combustion chamber.

2. Feed not adjustedair.

3. There is no compression. Burnt and deformed valves do not provide compression. The reason for the lack of compression may be an incorrect assembly of the cylinder-piston group, as well as a malfunction of the cylinder itself.

4. The gas distribution mechanism responsible for the operation of the valves is faulty.

5. Faulty spark plug.6. The ignition spark is not produced during the mechanical operation of the generator.

The principle of operation of the ignition on the engine of a 4-stroke scooter

The ignition on a 4t scooter depends on the timing of the movement of the gas distribution shaft located in the cylinder head and the magneto. On the outer side of the rotor housing there is a protrusion that contacts the ignition sensor during rotation. At the moment of contact, a spark appears on the candle. The rotor is connected to the crankshaft. At the moment the spark occurs, the crankshaft and piston are in the extreme position of the dead center. How to set the ignition on a 4t scooter? It is necessary that during the passage of the dead center, the position of the gas distribution shaft corresponds to the moment of ignition of the fuel in the combustion chamber.

Starting ignition adjustment

Before you set the ignition on a 4t scooter, you need to make sure that there is a spark and the candle is working. To do this, unscrew the latter, connect it to the ignition cable and press it against the frame with a metal case. When the rotor rotates, a clearly visible spark should appear, the presence of which indicates the correct functioning of the generator, as well as the candle itself.

4t scooter ignition adjustment

In order for the rotation of the generator rotor and gas distribution shaft to correspond to the desired cycle of the piston, it is necessary to set their position according to the marks. On the body of the magneto there is a marker for the position of the dead center of the cylinder in the form of the letter "T". The rotor can be set manually, it can also be done using a kick starter. The position of the gas distribution shaft is determined by the marks on the timing star. Three points applied to the star from the outside form an equilateral triangle, the top of which should be directed to the extreme position from the piston. Ignition adjustment consists in setting the correct position of the timing star.

Ignition advance

How to set the ignition on a 4t scooter ahead of time? There is an opinion that if you do this, then the speed and power of the motor will increase. In theory, it is. If the spark at the moment of compression occurs a little earlier than the moment the cylinder passes the dead center, this should give the desired effect. But the technical implementation of such an ignition setting on a scooter is associated with the transfer of its protrusion on the generator rotor housing. There is a way that is simpler and safer, giving a certain effect. You can make a step on the ignition ledge. To do this, remove a layer of 0.5 mm from half the surface of the protrusion. The step should start on the side that first contacts the ignition sensor. The resulting double spark will provide a more predictable engine start as well as increasedthe likelihood of ignition when exposed to adverse factors associated with weather conditions and incorrect settings for the fuel and air supply.