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

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Other materials:

Adjusting the throttle cable free play
Throttle cable free play The throttle cable free play should measure 3.0-5.0 mm (0.12-0.20 in) at the throttle grip. Periodically check the throttle cable free play and, if necessary, adjust it as follows. TIP The engine idling speed must be correctly adjusted before checkin ...

Checking the valve seats
The following procedure applies to all of the valves and valve seats. 1. Eliminate: Carbon deposits (from the valve face and valve seat) 2. Check: Valve seat Pitting/wear Replace the cylinder head. 3. Measure: Valve seat width C "a" Out of specification Replace the ...

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 ...