Suzuki RV125, Service Manual

Page: 203 / 251

7-4 SERVICING INFORMATION
Complaint Symptom and possible causes Remedy
Engine idles poorly. 1. Valve clearance out of adjustment
2. Improper valve seating
3. Worn valve guide
4. Worn camshaft
5. Excessive spark plug gap
6. Defective ignition coil
7. Defective generator
8. Defective ignitor unit
9. Defective pick-up coil
10. Incorrect float chamber fuel level
11. Clogged carburetor jet
Adjust.
Repair or replace.
Replace.
Replace.
Adjust or replace.
Replace.
Replace.
Replace.
Replace.
Adjust float height.
Clean.
Engine runs poorly in
high-speed range. 1. Weak valve spring
2. Worn camshaft
3. Insufficient spark plug gap
4. Mistimed valves
5. Ignition not advanced sufficiently due to poorly working
timing advance circuit
6. Defective ignition coil
7. Defective generator
8. Defective ignitor unit
9. Low float chamber fuel level
10. Dirty air cleaner element
11. Clogged fuel hose, resulting in inadequate fuel supply
to carburetor
Replace.
Replace.
Regap or replace.
Adjust.
Replace CDI unit.
Replace.
Replace.
Replace.
Adjust float height.
Clean or replace.
Clean and prime.
Exhaust smoke is
dirty or thick. 1. Excessive amount of engine oil
2. Worn cylinder
3. Worn piston ring
4. Worn valve guide
5. Scored or scuffed cylinder wall
6. Worn valve stem
7. Defective valve stem oil seal
8. Worn oil ring side rail Check level and drain.
Replace.
Replace.
Replace.
Replace.
Replace valve.
Replace.
Replace oil ring.
Engine lacks power. 1. Insufficient valve clearance
2. Weak valve spring
3. Mistimed valves
4. Worn cylinder
5. Worn piston ring
6. Improper valve seating
7. Fouled spark plug
8. Incorrect spark plug
9. Clogged carburetor jet
10. Incorrect float chamber fuel level
11. Dirty air cleaner element
12. Air leakage from intake pipe
13. Excessive amount of engine oil
Adjust.
Replace.
Adjust.
Replace.
Replace.
Repair or replace.
Clean or replace.
Replace.
Clean.
Adjust float height.
Clean or replace.
Tighten or replace.
Check level and drain.