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:

    Starting failures
    Engine 1. Cylinder and cylinder head - Loose spark plug - Loose cylinder head or cylinder - Damaged cylinder head gasket - Damaged cylinder gasket - Worn or damaged cylinder - Incorrect valve clearance - Improperly sealed valve - Incorrect valve-to-valve-seat contact - Incorrect valve timi ...

    Cable routing
    Front brake light switch lead Right handlebar switch lead Throttle cable Main switch Clutch cable Clutch switch lead Left handlebar switch lead Sub-wire harness Horn Speed sensor lead Front brake hose Main switch lead Left headlight assembly lead Right headlight asse ...

    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. ...

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