Carburetor - Suzuki DR-Z400S 2001 Service Manual

Complaint
Engine overheats.

CARBURETOR

Complaint
Starting difficulty.
Idling or low-speed
trouble.
Medium or high-
speed trouble.
Overflow and fuel
level fluctuations.
Symptom and possible causes
1. Carbon buildup on piston crown.
2. Insufficient amount of engine oil.
3. Defective oil pump.
4. Clogged oil circuit.
5. Float chamber fuel level too low.
6. Air leakage from intake pipe.
7. Incorrect engine oil.
Symptom and possible causes
1. Clogged starter jet.
2. Clogged starter jet passage.
3. Air leaking from joint between starter body and carbu-
retor.
4. Air leaking from carburetor joint or vacuum hose joint.
5. Improperly working starter (enricher) plunger.
1. Clogged or loose pilot jet.
2. Clogged or loose pilot air jet.
3. Air leaking from carburetor joint, vacuum pipe joint, or
starter.
4. Clogged pilot outlet port.
5. Clogged bypass port.
6. Starter (enricher) plunger not fully closed.
1. Clogged main jet.
2. Clogged main air jet.
3. Clogged needle jet.
4. Improperly working throttle valve.
5. Clogged fuel filter.
1. Worn or damaged needle valve.
2. Broken needle valve spring.
3. Improperly working float.
4. Foreign matter on the needle valve.
5. Incorrect float chamber fuel level.
SERVICING INFORMATION
Remedy
Clean.
Check level and add.
Replace.
Clean.
Adjust float height.
Tighten or replace.
Change.
Remedy
Clean.
Clean.
Tighten, adjust, or replace
gasket.
Tighten or replace defective
part.
Adjust.
Clean or tighten.
Clean or tighten.
Tighten or replace defective
part.
Clean.
Clean.
Adjust.
Clean.
Clean.
Clean.
Adjust.
Clean or replace.
Replace.
Replace.
Adjust or replace.
Clean or replace with needle
valve seat.
Adjust float height.
8-5