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Remove the fuel "turncock" from the bottom of the gas tank. I'll bet you'll find that it's full of gunk and debris. What I did was clean it out with carb cleaner then removed the fuel tank, emptied it except for about a cup of gasoline. Then I put about 6 small nuts and bolts in it and shook it around really well. The nuts and bolts knocked all kids of debris loose from the bottom of the tank. I then removed the nuts and bolts, put the fuel line back on and she started right up! Hope thus helps.
The connection is under the seat, however, the lines go up the underside of the tank. You will need to pull the tank in order to remove the speedo properly. Once you take the seat off, there will be two bolts holding the tank down (under the front of the seat, at the bottom of the tank). Turn your fuel petcock to off, remove the fuel line from the carb feed, remove those two bolts under the seat near the bottom of the tank, lift up a bit and wiggle the tank off of the front mounts, and the tank is free. Now you can get under the tank and get the wires out without damaging things.
Remove the rider's seat, using
an Allen socket to unscrew the pair of bolts that secure the rear of the
seat to the frame. Lift the rear of the seat upward then pull the seat
toward the rear of the motorcycle to disengage it from the frame's catch
tabs.
2
Remove the pair of bolts that
secure the front of the gas tank to the frame. Lift the fuel tank upward
on the pivot at the base of the tank. Support the fuel tank against the
frame using the tank's support rod.
3
Remove the air box. Pull the
three air hoses from the air box. Loosen the clamps on the air box's
rubber boots with a screwdriver, and pull the air box out of the
motorcycle.
4
Pull the four coil packs out of
the motor's cylinders. Clear any dirt and debris that has accumulated on
top of the cylinders with compressed air, directing the air into the
spark plug holes that the coil packs were installed in. Remove the spark
plugs using a spark plug socket attached to a socket extension.
5
Install new, properly gapped
spark plugs into the motor with a spark plug socket. Tighten the socket
until it is seated firmly against the motor. Reinstall the coil packs
onto the spark plugs.
6
Reinstall the air box,
tightening the clamps on the rubber boots to secure the air box to the
throttle bodies. Reconnect the trio of air hoses to the air box.
7
Remove the tank support rod and
lower the fuel tank onto the frame. Insert and tighten the fuel tank
bolts with an Allen socket. Reinstall the seat, firmly tightening the
mounting bolts with an Allen socket.
Fig. Fuel pump flange bolt torque sequence-2002 Explorer and Mountaineer and Sport-Trac Sport Built Before 03/2002
Before servicing the vehicle, please familiarize yourself with safety procedures.
Disconnect the battery ground cable.
Relieve the fuel system pressure.
Drain the fuel tank.
4WD vehicle
Remove the fuel tank skid plate bolts.
Remove the fuel tank skid plate rear left bolt.
Remove the fuel tank skid plate rear right bolt and lower the fuel tank skid plate.
All vehicles
Use a suitable jack to support the fuel tank.
Remove the vent hose.
Remove the bolt and reposition the fuel tank support strap.
Remove the support bolts and push the fuel tank back until the lip clears the support bracket.
Lower the fuel tank just enough to expose the fuel lines and the fuel tank transducer connector.
Disconnect the fuel line and the vapor line.
Disconnect the fuel tank electrical supply connector near the frame rail. Lower the fuel tank.
Clean the area around the fuel pump assembly mounting flange.
Disconnect the electrical connector from the fuel pressure transducer.
WARNING
The fuel pump assembly must be handled carefully to avoid damage to the float arm and the filter.
Remove the fuel pump mounting bolts and remove the fuel pump assembly.
There should be two bolts holding your tank on. One is near the handlebars and the other should be between the tank and the seat. You may need to remove your seat to get to that bolt. You will need to remove your fuel line from the tank also.
REMOVE THE REAR BACK SEAT BOTTOM TO GAIN ACCESS, THE SEAT IS HELD IN BY 2 BOLTS. YOU WILL NEED A 10MM OR 12MM SOCKET TO LOOSEN THE SEAT. BOLTS ARE LOCATED BETWEEN THE SPACE WHERE THE SEAT MEETS THE SEAT BACK. WHERE THE REAR SEAT BELTS COME OUT. WHEN BOLT ARE REMOVED PUT YOUR HAND BETWEEN THE SEAT AND PULL UP YOU WILL SEE WHERE THE FRONT HALF OF THE SEAT IS SECURED BY A 'L' SHAPE BRACKET LOCATED IN THE FRONT HALF OF THE REAR SEAT GOING INTO THE FLOOR BOARD.
Follow this steps on how to replace the spark plugs,
1.
Locate your spark plugs before beginning. Accessing the spark plugs
can vary greatly depending on the model of motorcycle. The Ninja
series bikes place the spark plugs near the top of the motor, hidden
beneath the fuel tank and air box.
2.
Remove the seat and fuel tank. Locate the bolts that secure the fuel
tank to the frame and remove them with a socket wrench. Lift the
fuel tank upwards and disconnect the fuel lines. Pull the entire
tank away from the motorcycle and set it aside.
3.
Unscrew the air box lid with a screwdriver and remove. Remove the
air filter and locate the bolts that secure the air box to the
motor. Unscrew the bolts with a screwdriver and pull the air box off
of the motor. Take note of the locations of any wiring or hoses that
may be attached to the air box before disconnecting them.
4.
Pull the spark plug wire off of the first spark plug and clear the
plug cavity with compressed air to remove dirt or debris that may
been trapped. Remove the spark plug with a spark-plug socket. If
needed, use a socket extension to reach the spark plug in the
cavity.
5.
Insert a new spark plug into the cavity and carefully tighten with a
spark plug socket. Slide the spark plug wire onto the end of the
spark plug and press down until the wire clicks into place.
6.
Repeat as necessary for any remaining spark plugs. Reinstall the air
box and reconnect any hoses or wiring removed earlier. Insert the
air filter into the air box and seal the lid by tightening its bolts
with a screwdriver
7.
Reinstall the fuel tank, reconnecting the fuel lines and tightening
the mounting bolts with a socket wrench. Replace the seat.
You didn't say for sure what year your 125 is. If it is an older bike '85, the tank has a single bolt at the back. Remove the bolt and shove the tank to the rear of the bike about 2 inches to clear the rubber mounts, then lift upward. See diagram. I haven't worked on any newer 125s but if the picture in the posting is what you have, the seat will probably need to be removed to get to any mounting bolts for the tank.
Push back release rod - 9 - by operating remote control unlock and remove bolt - 2 -.
Remove rubber part - 8 - from tank filler flange and swivel out tank flap unit - 1 - from side panel - 7 -.Assembly piece - 4 - and actuator - 6 - is installed.
Install tank flap unit - 1 - (rubber part rolled up) with hinge side first.
Bolt tank flap unit - 1 - and assembly piece - 4 - with bolt - 2 -.
Tightening torques: Bolts - 2 - 1.5 Nm
Remove side luggage compartment trim.
Disconnect harness connector at actuator - 6 -.
Remove actuator - 6 - using special tool Socket wrench T 10010 from angled mounting bracket.
Remove actuator - 6 - together with release rod - 9 - from seal - 5 - and assembly piece - 4 -.
Installing Installation is reverse of removal. Tightening torques: Bolts for actuator - 6 - 1.5 Nm .
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