The TX-193 tachometer from the VAZ-2106 car is best suited for installation on domestic motorcycles due to its accuracy, small size, low weight, low energy consumption and adaptability to work in shaking and vibration conditions. Moreover, this tachometer model has a low cost compared to specialized motorcycle tachometers.
It is necessary
tachometer TX-193 from VAZ-2106
Connecting a tachometer to a two-stroke two-cylinder motorcycle equipped with an electric starter, a battery and a single-channel electronic ignition system with a two-spark ignition coil does not fundamentally differ from the standard connection on a VAZ-2106 car. Connect the tachometer input to the output of the primary winding of the high-voltage ignition coil, and connect the power supply from the battery using the positive and negative wires. Insert a switch into the positive wire so that the battery is not discharged in the parking lot. If the motorcycle is of foreign manufacture, connect the tachometer power supply through the ignition switch. It must have appropriate contacts for connecting additional devices.
If a two-cylinder, two-stroke motorcycle with single-channel ignition does not have an electric starter, connect the battery to the output of the rectifier, and connect power to the tachometer from the battery through the switch. If your motorcycle does not have a rectifier, equip it with one. To do this, purchase a straightener suitable for the design of the motorcycle.
If the motorcycle is not equipped with a battery (moped, old motorcycle model), install a battery on it. In the simplest version, choose a battery from an uninterruptible power supply, from a rechargeable flashlight, or a small-sized motorcycle battery. Connecting a tachometer without a battery directly from the generator coil will damage the tachometer. To do this, you will have to assemble or order a thyristor voltage regulator with parallel connection of thyristors to a familiar radio amateur.
To connect the tachometer to a two-cylinder motorcycle with dual-channel ignition, supply the tachometer with a stable voltage using the voltage regulator described above, ensure that pulses from both cylinders are supplied to the tachometer input. To fulfill the last condition, duplicate the tachometer input circuit by drilling a hole in the back of the device. Through this hole, route the additional entry to the screw using a wire.
Connect the tachometer to a three-cylinder motorcycle in the same way as for a two-cylinder motorcycle with dual-channel ignition. Ignition systems for three-cylinder engines are usually three-channel. Apply pulses to the tachometer input from any two of the three ignition coils. The pulse intervals will be uneven, but measurement accuracy will not be affected. It is possible to connect a tachometer to a four- or six-cylinder motorcycle, but for such a motorcycle it would be best to install a proprietary tachometer designed for this engine.
The hardest part is connecting a tachometer to a single cylinder motorcycle. To do this, disassemble the tachometer, remove its electrical circuit and adjust the resistor R7 to increase the sensitivity of the device. If the adjustment limits are not enough, double the capacity of the capacitor C5 and try to re-adjust the resistor by comparing the TX-193 tachometer readings with the reference tachometer readings.