Get an RPM meter (tachometer) for 1 cylinder 4 stroke engine to match with your engine.
Connect ground wire from RPM to body, usually black colored wire.
Connect power wire to ignition switch, make sure it is connected to 'ON' position of switch, this wire usually with yellow insulation.
Connect green wire to coil negative terminal, this terminal is connected to contact point or ignition trigger system, the wire from tachometer is usually with green insulation.
Start your engine and check RPM reading.
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