Suzuki GN125F, Service Manual

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7-3
S E RV I C E I N F O R M AT I O N
Trouble with
starting.
Idle or low speed
trouble.
Medium or high-
speed trouble.
Overflow and fuel
level fluctuations.
CARBURETOR
Remedy Symptom and possible causes Complaint
1.Starting jet is clogged.
2.Starting pipe is clogged.
3. Air leakage from a joint between choke and carburetor.
A
.Starting plunger is not operated properly.
4. ir leakage at carburetor joint or vacuum tube joint.
5
Clean.
Clean.
Check and retighten.
Check and adjust.
Check and retighten.
1. Idle jet, idle air jet are clogged or loose.
2.
3. Idle outlet or by-pass is clogged.
4. Starting plunger is not fully closed.
Air leakage at carburetor joint, vacuum tube joint or
choke.
Check and clean.
Check and clean.
Check and adjust.
Check and retighten.
1. Main jet or main air jet is clogged.
2. Bubbling pipe is clogged.
3. Throttle valve is not operated properly.
4. Air filter is clogged.
Check and clean.
Check and clean.
Check and adjust.
Check and clean.
1. Needle valve is worn or damaged.
2. Needle valve spring is broken.
3. Float is not working properly.
4. Foreign matter has adhered to needle valve.
Replace.
Replace.
Check and adjust.
Clean.
BRAKES
Complaint
Poor braking.
Brake squeaking.
Excessive brake
lever free stroke.
Leakage of brake
fluid.
Symptom and possible causes Remedy
1. Not enough brake fluid in the reservoir.
2. Air trapped in brae fluid circuit.
3. Pads worn down.
4.
5.
6. Wheel hub worn down.
. Too much play on brake lever.
Linings worn down.
Brake disc worn down.
7. Oil adhesion on engaging surface of pads or linings.
8
Check and refill to level mark.
Bleed air out.
Replace.
Replace.
Replace.
Replace.
Clean.
Adjust.
1.Carbon adhesion on pad surface.
2.Tilted pad.
3.Damaged wheel bearing.
4.Loose front-wheel axle or rear-wheel axle.
5.
or linings
6.Foreign material in brake fluid.
7.Clogged return port of master cylinder
Pads worn down.
1.Air in hydraulic system.
2.Brake lever cam worn down.
3.Insufficient brake fluid.
4.Improper quality of brake fluid.
5.Brake linings or wheel hub worn down.
1.Insufficlent tightening of connection joints.
2.Cracked hose.
3.Worn piston and/or seal ring.
Repair surface with sandpaper.
Modify pad fitting.
Replace.
Tighten to specified torque.
Replace.
Replace brake fluid.
Disassemble and clean master
cylinder.
Bleed air out.
Replace brake lever.
Replenish .
Replace with correct fluid.
Replace.
Tighten to specified torque.
Replace.
Replace piston and/or cup.