Yamaha YZF-R125 Service Manual: Checking the timing chain and timing chain guide

Yamaha YZF-R125 Service Manual / Engine / Crankcase / Checking the timing chain and timing chain guide

1. Check:

  • Timing chain Damage/stiffness Replace the
    timing chain and camshaft sprocket as a set.

2. Check:

Timing chain guide (intake side) Damage/wear Replace.


Checking the oil strainer

1. Check:

Oil strainer Damage   Replace.


Contaminants Clean with solvent.


    Checking the crankcase
    1. Thoroughly wash the crankcase halves in a mild solvent. 2. Thoroughly clean all the gasket surfaces and crankcase mating surfaces. 3. Check: Crankcase Cracks/damage Replace. Oil de ...

    Checking the bearings and oil seal
    1. Check: Bearings Clean and lubricate the bearings, and then rotate the inner race with your finger. Rough movement Replace. Oil seal Damage/wear Replace. ...

    Other materials:

    Avoid Carbon Monoxide Poisoning
    All engine exhaust contains carbon monoxide, a deadly gas. Breathing carbon monoxide can cause headaches, dizziness, drowsiness, nausea, confusion, and eventually death. Carbon Monoxide is a colorless, odorless, tasteless gas which may be present even if you do not see or smell any en ...

    For your safety - pre-operation checks
    Inspect your vehicle each time you use it to make sure the vehicle is in safe operating condition. Always follow the inspection and maintenance procedures and schedules described in the Owner's Manual. WARNING Failure to inspect or maintain the vehicle properly increases the possibility of ...

    Removing the primary drive gear and balancer gears
    1. Loosen: Primary drive gear nut "1" NOTE: Place the aluminum plate "a" between the balancer drive gear "2" and the balancer driven gear "3", and then loosen the primary drive gear nut. 2. Straighten the lock washer tab. 3. Loosen: Balancer driven gear nut "1" NOTE: Place ...

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