Yamaha YZF-R125 Service Manual: Fuel system

Installing the water pump
1. Install: Water pump assembly "1" O-rings "2" NOTE: Align the projection "a" on the impeller shaft with the slit "b" on the camshaft sprocket bolt. Lubricate the O-rings with a thi ...

Fuel tank
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Other materials:

Checking the fid (fast idle solenoid)
1. Disconnect: FID (fast idle solenoid) coupler 2. Check: FID (fast idle solenoid) resistance a. Disconnect the FID (fast idle solenoid) coupler from the FID. b. Connect the pocket tester ( × 10) to the terminals of the FID (fast idle solenoid). Positive tester probe ...

Adjusting the engine idling speed
The engine idling speed must be checked and, if necessary, adjusted as follows at the intervals specified in the periodic maintenance and lubrication chart. The engine should be warm before making this adjustment. Remove panel A. Check the engine idling speed and, if necessary, ...

Checking the rectifier/regulator
1. Check: Rectifier/regulator output voltage Out of specification → Replace the rectifier/ regulator. a. Set the engine tachometer to the spark plug lead. b. Connect the pocket tester (DC 20 V) to the rectifier/regulator coupler as shown. Positive tester probe red "1" Negat ...

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