Yamaha YZF-R125 Service Manual: Periodic checks and adjustments
- Periodic maintenance
- Engine
- Adjusting the valve clearance
- Adjusting the exhaust gas volume
- Adjusting the engine idling speed
- Adjusting the throttle cable free play
- Checking the spark plug
- Checking the ignition timing
- Measuring the compression pressure
- Checking the engine oil level
- Changing the engine oil
- Adjusting the clutch cable free play
- Cleaning the air filter element
- Checking the throttle body joint and air filter case joint
- Checking the fuel line
- Checking the cylinder head breather hose
- Checking the exhaust system
- Checking the coolant level
- Checking the cooling system
- Changing the coolant
- Chassis
- Adjusting the rear disc brake
- Checking the brake fluid level
- Checking the front brake pads
- Checking the rear brake pads
- Checking the front brake hose
- Checking the rear brake hose
- Bleeding the hydraulic brake system
- Adjusting the drive chain slack
- Lubricating the drive chain
- Checking and adjusting the steering head
- Checking the front fork
- Checking the tires
- Checking the wheels
- Checking and lubricating the cables
- Electrical system
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 sen ...
Other materials:
Checking the bulbs and bulb sockets
NOTE:
Do not check any of the lights that use LEDs.
Check each bulb and bulb socket for damage or
wear, proper connections, and also for continuity
between the terminals.
Damage/wear Repair or replace
the bulb,
bulb socket or both.
Improperly connected Properly
connect.
No c ...
Checking the valves and valve guides
The following procedure applies to all of the
valves and valve guides.
1. Measure:
Valve-stem-to-valve-guide clearance
Out of specification Replace the
valve
guide.
Valve-stem-to-valve-guide clearance =
Valve guide inside diameter "a" -
Valve stem diameter "b"
2. Replace:
...
Checking the camshaft sprocket and timing chain guide
1. Check:
Camshaft sprocket
More than 1/4 tooth wear "a" Replace
the
camshaft sprocket, timing chain and crankshaft
as a set.
a. 1/4 tooth
b. Correct
1. Timing chain roller
2. Camshaft sprocket
2. Check:
Timing chain guide (exhaust side)
Damage/wear Replace.
...