Yamaha YZF-R125 Service Manual: Checking the valve springs
The following procedure applies to all of the valve springs.
1. Measure:
- Valve spring free length "a"
Out of specification Replace the valve
spring.
2. Measure:
- Compressed valve spring force "a"
Out of specification Replace the valve
spring.
b. Installed length
3. Measure:
- Valve spring tilt "a"
Out of specification
Replace the
valve spring.
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 ...
Installing the valves
The following procedure applies to all of the
valves and related components.
1. Deburr:
Valve stem end
(with an oil stone)
2. Lubricate:
Valve stem "1"
Valve stem seal "2"
(with ...
Other materials:
Checking and lubricating the brake and clutch levers
Brake lever
Brake lever
Clutch lever
Clutch lever
The operation of the brake and clutch
levers should be checked before each
ride, and the lever pivots should be lubricated
if necessary.
Recommended lubricants:Brake lever:
Silicone grease
Clutch lever:
Lithium-soap ...
Assembling the rear brake caliper
WARNING
Before installation, all internal brake components
should be cleaned and lubricated
with clean or new brake fluid.
Never use solvents on internal brake components
as they will cause the brake caliper
piston dust seal and piston seal to swell
and distort.
...
Checking the engine oil level
1. Stand the vehicle on a level surface.
NOTE:
Place the vehicle on a suitable stand.
Make sure the vehicle is upright.
2. Start the engine, warm it up for several minutes,
and then turn it off.
3. Check:
Engine oil level
The engine oil level should be between the
minimum level ...