Yamaha YZF-R125 Service Manual: Checking the drive sprocket

Yamaha YZF-R125 Service Manual / Chassis / Chain drive / Checking the drive sprocket

1. Check:

  • Drive sprocket More than 1/4 tooth "a" wear
    Replace the drive chain sprockets as a set.

    Bent teeth Replace the drive
    chain sprockets as a set.

Checking the drive sprocket


b. Correct

1. Drive chain roller

2. Drive chain sprocket

Checking the rear wheel sprocket

Refer to "CHECKING AND REPLACING THE REAR WHEEL SPROCKET" on page 4-15.

Checking the rear wheel drive hub

Refer to "CHECKING THE REAR WHEEL DRIVE HUB" on page 4-15.

    Checking the drive chain
    1. Measure: 15-link section "a" of the drive chain Out of specification Replace the drive chain. a. Measure the length "a" between the inner sides of the pins and the length "b" between t ...

    Installing the drive chain
    1. Lubricate: Drive chain Master link 2. Install: Drive sprocket Drive sprocket retainer bolts 3. Install: Master link O-rings Master link plate Master link clip "1" ...

    Other materials:

    Checking the starter clutch
    1. Check: Starter clutch rollers "1" Starter clutch spring caps "2" Starter clutch springs "3" Damage/wear Replace the starter clutch assembly. 2. Check: Starter clutch idle gear Starter clutch gear Burrs/chips/roughness/wear Replace the defective part(s). 3. Check: ...

    Installing the steering head
    1. Lubricate: Upper bearing Lower bearing Bearing races 2. Install: Lower ring nut Rubber washer Upper ring nut Lock washer Refer to "CHECKING AND ADJUSTING THE STEERING HEAD" on page 3-22. 3. Install: Upper bracket Steering stem nut NOTE: Temporarily tighten t ...

    Installing the front brake caliper
    1. Install: Brake caliper "1" (temporarily) Copper washers "2" Brake hose "3" Brake hose union bolt "4" WARNINGProper brake hose routing is essential to insure safe vehicle operation. Refer to "CABLE ROUTING" on page 2-33. CAUTION: Install the brake ...

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