Safety Message: When testing the charging system, be cautious of moving engine parts and high-heat areas. Ensure all electrical connections are tight and corrosion-free. Improper testing or short-circuiting stator wires can damage the voltage regulator or the ECU.
The Yamaha YBR 125 Generator / Stator Testing post outlines how to identify and test the core components of the bike's charging and ignition-timing system.
Wiring Identification:
The stator assembly connector typically contains five wires:
3 White Wires: These are the charging coils (stator phases).
Blue Wire: Connected to the neutral switch.
Red and White Wires: Connected to the Crank Position Sensor (pickup coil).
Stator Resistance Testing (Static):
Set your multimeter to the Ohms (Ω) scale.
Unplug the stator connector from the main wiring loom.
Measure the resistance between each of the three white wires (1-2, 1-3, and 2-3).
The readings should be very low and equal across all three pairings (typically around 0.5 to 1.5 Ω depending on the specific model year).
Check for continuity to ground: Touch one probe to a white wire and the other to the engine casing. There should be no continuity (Infinite resistance); if there is, the stator is "shorted to ground."
Voltage Output Testing (Dynamic):
With the engine running and the stator connected, you can measure AC voltage across the white wires. This should increase significantly with RPM (often reaching 50V+ AC at high revs). Note: This requires extreme care and is usually done only if the resistance test is inconclusive.
buy stators from ebay uk here
3 white stator wires , blue neutral switch , red and white crank sensor .
see more Yamaha YBR 125 blog posts
How many watts can this supply in the output? Thanks
ReplyDeleteHow many watts can this supply in the output? Thanks.
ReplyDelete