ST500 Tach-Timer Maintenance
© Stack Limited
55
See the instructions supplied in this manual. If connected directly to
the coil, check that it is to the switched low tension side (usually the
negative side).
Tachometer value too high or too low by a constant %-age amount
• System configured with wrong number of engine cylinders
Reconfigure the system to the correct number of cylinders
• The vehicle is using a 2-stroke engine
Set the number of cylinders to twice the actual number
e.g. A 2-cylinder 2-stroke engine requires the number of cylinders to
be set to 4.
• Ignition system pulses per revolution not the same as the
number of cylinders
Reconfigure the system to the correct number of pulses per revolution
Ignition systems may use multiple coils where each additional coil
gives proportionately fewer pulses per revolution.
Tachometer reading erratic, pointer jumps high or low
• Incorrect wiring
Reconnect the tachometer as specified in this manual
• Signal not intended to drive a Tachometer
Check for a more suitable connection point
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