Yamaha YZF-R125 Service Manual: Removing the fuel tank
1. Extract the fuel in the fuel tank through the fuel tank filler hole with a pump.
2. Remove:
- Fuel hose connector cover "1"
3. Disconnect:
- Fuel hose "2"
CAUTION:
|
NOTE:
Before removing the hose, place a few rags in the area under where it will be removed.
4. Remove:
- Fuel tank
Checking the fuel pump body
1. Check:
Fuel pump body
Obstruction 
Clean.
Cracks/damage
Replace the fuel tank.
Fuel tank
...
Installing the fuel hose
1. Install:
Fuel hose
Fuel hose connector cover
CAUTION:When installing the fuel hose, make sure
that
it is securely connected, and that the fuel
hose connector cover is in t ...
Other materials:
Removing the valves
The following procedure applies to all of the
valves and related components.
NOTE:
Before removing the internal parts of the cylinder
head (e.g., valves, valve springs, valve seats),
make sure the valves properly seal.
1. Check:
Valve sealing
Leakage at the valve seat Check
the valve
...
Checking the cylinder and piston
1. Check:
Piston wall
Cylinder wall
Vertical scratches Replace the
cylinder,
and replace the piston and piston rings as a
set.
2. Measure:
Piston-to-cylinder clearance
a. Measure cylinder bore "C" with the cylinder
bore gauge.
NOTE:
Measure cylinder bore "C" by takin ...
Unstable handling
Handlebars
- Bent or improperly installed right handlebar
- Bent or improperly installed left handlebar
1. Steering head components
- Improperly installed upper bracket
- Improperly installed lower bracket
(improperly tightened ring nut)
- Bent steering stem
- Damaged ball bearing or bearing ...