How to Test Your Injector
Set to Ohms: Turn your multimeter dial to the resistance setting (usually the range).
Probe the Terminals: Place one probe on each of the two metal pins inside the injector's electrical connector.
Check the Reading: * Healthy: For a Yamaha YZF-R125, you are looking for a reading between 12.0 ohm and 15.0 ohm
Failed: A reading of 0 ohm means a short circuit; a reading of "OL" (Open Loop) means the internal coil is broken.
How to test the coil inside the injector on the R125, if the coil is high resistance it will affect funcition and therefore operation of the motorbike if the injector is open circuit ie the coil inside is split then no operation of the injector is possible.
More advanced method
Safety First: This procedure involves pressurized fuel. Work outdoors, keep a fire extinguisher nearby, and ensure all electrical switches are spark-proof.
The Technical Benchmarks
To verify if your R125 injector is performing to factory standards, use these "Source of Truth" numbers:
Target Flow Rate: A standard YZF-R125 injector should flow approximately 100cc to 110cc per minute.
Operating Pressure: The test must be conducted at exactly 43.5 PSI (3.0 Bar) to mimic the bike's fuel pump.
Electrical Resistance: Use a multimeter to confirm a resistance of 12.0 Ω to 15.0 Ω. Anything outside this range indicates a failing solenoid coil.
Precision Tools for the Rig
To move beyond "guesswork," incorporate these tools into your DIY setup:
Variable DC Power Supply: Provides a steady, adjustable voltage. This is critical for pulsing the injector safely without the voltage spikes common with raw battery connections.
Graduated Measuring Cylinders: Essential for capturing fuel during the 60-second flow test. Accurate cc/min readings are impossible without clear, fuel-resistant increments.
Digital Multimeter: The first line of defense. Always check the ohms before introducing fuel to ensure the injector isn't electronically "dead."
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