We set the ignition. Drawing, description

PERSONAL TRANSPORT: GROUND, WATER, AIR
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We set the ignition. Personal transport

Personal transport: land, water, air

Directory / Personal transport: land, water, air

MMVZ-3 115 engines are often used on karts and - with the appropriate modernization of the air cooling system - on motoblocks and microtractors. Among the works on their maintenance there is such as the installation of the ignition. At first glance, it is simple: the ignition moment specified in the instructions for the engine corresponds to such a position of the sensor rotor when its longitudinal groove coincides with the protrusion on the sensor winding frame. But this is not always the case: a spark occurs either earlier or later than expected. Apparently, due to the spread of the electrical parameters of the switch.

To set the correct ignition timing, you can use more reliable systems - with stroboscopes, but the easiest way to do this is as follows.

We insert a high-voltage spark plug wire of such a length into the ignition coil that it is enough to reach the rotor, and set the ignition as recommended in the instructions: the advance value is 3-3,5 mm to top dead center (TDC) and the position of the protrusion on the frame of the sensor winding is opposite the groove in the tail of the rotor.

We expose the ignition
The moment of spark occurrence: 1 - stator, 2 - rotor, 3 - longitudinal groove, 4 - bare end of the high-voltage wire, 5 - plasticine, 6 - sensor winding

And now we attach to the coil (you can even use plasticine) a high-voltage wire with a bare end so that it is 3-4 mm away from the rotor. By rotating the rear wheels with the direct gear engaged (go-kart, walk-behind tractor on a stand), you can see the moment a spark occurs (the test must be carried out in a darkened room). The spark should jump towards the rotor just when the groove is aligned with the bare end of the wire. If it occurs earlier or later, that is, it does not fall into the groove, but nearby, then an amendment must be made - make a mark on the rotor with a chisel, along which to set the ignition in the future, turning the generator stator in one direction or another.

Author: D.Sukachev

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