Yamaha YZF-R125 Service Manual: Installing the primary drive gear and balancer gears

Yamaha YZF-R125 Service Manual / Engine / Balancer gear / Installing the primary drive gear and balancer gears

1. Install:

  • Balancer driven gear "1"
  • Lock washer

  • Balancer drive gear "2"
  • Primary drive gear
  • Washer "3"
  • Balancer driven gear nut
  • Primary drive gear nut

NOTE:

  • Align the punch mark "a" in the balancer drive gear "2" with the punch mark "b" in the balancer driven gear "1".
  • Be sure to install the washer so that its sharp edge "c" is facing the primary drive gear.

Installing the primary drive gear and balancer gears


2. Tighten:

  • Balancer driven gear nut "1"
  • Primary drive gear nut "2"

NOTE:

  • Place the aluminum plate "a" between the balancer drive gear "3" and the balancer driven gear "4", and then tighten the balancer driven gear nut.
  • Place the aluminum plate "b" between the balancer drive gear "3" and the balancer driven gear "4", and then tighten the primary drive gear nut.

Installing the primary drive gear and balancer gears


3. Bend the lock washer tab along a flat side of the nut.

    Checking the balancer gears and primary drive gear
    1. Check: Balancer drive gear Balancer driven gear Cracks/damage/wear Replace. 2. Check: Primary drive gear Refer to "CHECKING THE PRIMARY DRIVE GEAR" on page 5-43. ...

    Crankcase
    ...

    Other materials:

    Checking the rear brake hose
    1. Check: Brake hoses "1" Cracks/damage/wear  Replace. 2. Check: Brake hose holder "2" Loose connection Tighten the holder bolt. Loose or open holder Fasten properly. 3. Hold the vehicle upright and apply the rear brake several times. 4. Check: Brake ho ...

    Replacing the rear brake pads
    NOTE: When replacing the brake pads, it is not necessary to disconnect the brake hose or disassemble the brake caliper. 1. Remove: Brake pads Brake pad spring NOTE: To remove the inner brake pad "1", push down on the brake caliper bracket so that there is space to remove the brake pa ...

    Checking the camshaft
    1. Check: Camshaft lobes Blue discoloration/pitting/scratches  Replace the camshaft. 2. Measure: Camshaft lobe dimensions "a" and "b" Out of specification Replace the camshaft. 3. Check: Camshaft oil passage Obstruction Blow out with compressed air. ...

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