Suzuki UG110 2021 Service Manual page 175

Complaint
Engine idles poorly.
Engine runs poorly in
high-speed range.
Exhaust smoke is dirty or
thick.
Engine lacks power.
Engine overheats.
Symptom and possible causes
1. Worn cylinder.
2. Worn piston rings.
3. Stiff piston ring.
4. Gas leaks from crankshaft oil seal.
5. Excessive spark plug gap.
6. Defective ignition coil.
7. Defective generator coil.
8. Incorrect float chamber fuel level.
9. Clogged carburetor jet.
10. Broken or damaged reed valve.
1. Worn cylinder.
2. Worn piston rings.
3. Stiff piston ring.
4. Insufficient spark plug gap.
5. Ignition not advanced sufficiently due to poorly working
timing advance circuit.
6. Defective generator coil.
7. Low float chamber fuel level.
8. Dirty air cleaner element.
9. Clogged fuel hose, resulting in inadequate fuel supply
to the carburetor.
10. Clogged fuel valve.
1. Incorrect engine oil.
1. Worn cylinder.
2. Worn piston rings.
3. Stiff piston rings.
4. Gas leaks from crankshaft oil seal.
5. Insufficient spark plug gap.
6. Clogged carburetor jet.
7. Incorrect float chamber fuel level.
8. Clogged air cleaner element.
9. Fouled spark plug.
10. Air leakage from intake pipe.
11. Slipping or worn drive belt.
12. Damaged or worn rollers in the movable drive face.
13. Weakened movable driven face spring.
14. Rich air/fuel mixture due to defective starter system.
1. Carbon build-up on piston crown.
2. Defective oil pump or clogged oil circuit.
3. Low float chamber fuel level.
4. Air leakage from intake pipe.
5. Incorrect engine oil.
6. Incorrect spark plug.
7. Clogged exhaust pipe/muffler.
SERVICING INFORMATION
Remedy
Replace.
Replace.
Replace.
Replace.
Adjust or replace.
Replace.
Replace.
Adjust float height.
Clean.
Replace.
Replace.
Replace.
Replace.
Regap or replace.
Replace.
Replace.
Adjust float height
Clean.
Clean and prime.
Clean.
Change.
Replace.
Replace.
Replace.
Replace.
Regap or replace.
Clean.
Adjust float height.
Clean.
Clean or replace.
Tighten or replace.
Replace.
Replace.
Replace.
Replace.
Clean.
Clean or replace.
Adjust float height.
Tighten or replace.
Change.
Change.
Clean or replace.
7-3