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:
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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:
Checking the cylinder head
1. Eliminate:
Combustion chamber carbon deposits
(with a rounded scraper)
NOTE:
Do not use a sharp instrument to avoid damaging
or scratching:
Spark plug bore threads
Valve seats
2. Check:
Cylinder head
Damage/scratches Replace.
Cylinder head water jacket
Min ...
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 ...
Checking and lubricating the cables
The operation of all control cables and
the condition of the cables should be
checked before each ride, and the cables
and cable ends should be lubricated
if necessary. If a cable is damaged
or does not move smoothly, have a
Yamaha dealer check or replace it.
WARNING! Damage to the out ...