Yamaha YZF-R125 Service Manual: Adjusting the drive chain slack
NOTE:
The drive chain slack must be checked at the tightest point on the chain.
| CAUTION: A drive chain that is too tight will overload the engine and other vital parts, and one that is too loose can skip and damage the swingarm or cause an accident. Therefore, keep the drive chain slack within the specified limits. |
1. Stand the vehicle on a level surface.
| WARNING Securely support the vehicle so that there is no danger of it falling over. |
NOTE:
Both wheels should be on the ground without a rider on the vehicle.
2. Turn the rear wheel several times and find the tightest position on the drive chain.
3. Check:
- Drive chain slack "a"
Out of specification
Adjust.
NOTE:
Measure the drive chain slack halfway between the drive axle and the rear wheel axle.
4. Adjust:
- Drive chain slack
a. Loosen the wheel axle nut "1".
b. Loosen both locknuts "2".
c. Turn both adjusting bolts "3" in direction "a" or
"b" until the specified drive chain slack is obtained.
NOTE:
- To maintain the proper wheel alignment, adjust both sides evenly
- Push the rear wheel forward to make sure there is no clearance between the drive chain pullers and the ends of the adjusting bolts.
d. Tighten the wheel axle nut to specification.
e. Tighten the locknuts to specification.
Bleeding the hydraulic brake system
WARNINGBleed the hydraulic brake system whenever:
the system is disassembled.
a brake hose is loosened, disconnected or
replaced.
the brake fluid level is very low.
brak ...
Lubricating the drive chain
The drive chain consists of many interacting
parts. If the drive chain is not maintained properly,
it will wear out quickly. Therefore, the drive
chain should be serviced, especially when the
vehi ...
Other materials:
Periodic maintenance and adjustment
Periodic inspection, adjustment, and lubrication
will keep your vehicle in the
safest and most efficient condition possible.
Safety is an obligation of the vehicle
owner/operator. The most important
points of vehicle inspection, adjustment,
and lubrication are explained on
the followin ...
Circuit diagram
4. Main fuse
5. Main switch
9. Battery
25.ECU (engine control unit)
36.License plate light
37.Tail/brake light
44.Headlight relay
46.Pass switch
47.Dimmer switch
51.Headlight (low beam)
52.Auxiliary light
54.Headlight (high beam)
58.Meter light
60.High beam indicator light
64.Ignit ...
Checking the ignition spark gap
1. Check:
Ignition spark gap
Out of specification Perform the
ignition
system troubleshooting, starting with step 5.
Refer to "TROUBLESHOOTING" on page
8-3.
NOTE:
If the ignition spark gap is within specification,
the ignition system circuit is operating normally.
a. Disconnect the spa ...