Engine General Information And Diagnosis; Diagnostic Information And Procedures; Engine Symptom Diagnosis - Suzuki LT-A400 Service Manual

Engine General Information and Diagnosis

Engine

Engine Symptom Diagnosis

Condition
Engine will not start or is
hard to start
(Compression too low)
Engine will not start or is
hard to start (Spark plug
not sparking)
Engine will not start or is
hard to start (No fuel
reaching the carburetor)
Engine stalls easily
Engine noisy (Excessive
valve chatter)
Engine noisy (Noise
seems to come from
piston)
Engine noisy (Noise
seems to come from the
cam chain)
Engine noisy (Noise
seems to come from
crankshaft)

Diagnostic Information and Procedures

Possible cause
Worn cylinder.
Worn piston ring.
Worn valve guide or improper valve
seating.
Loose spark plug.
Slow cranking starter motor.
Mistimed valves.
Valve clearance out of adjustment.
Fouled spark plug.
Wet spark plug.
Defective ignition coil.
Open or short in high-tension cord.
Defective generator
Defective CDI unit.
Clogged fuel tank vent hose.
Clogged or defective fuel valve.
Defective carburetor needle valve.
Clogged fuel hose.
Clogged fuel filter.
Fouled spark plug.
Defective generator.
Defective CDI unit.
Clogged or defective fuel valve.
Clogged carburetor jet.
Valve clearance out of adjustment.
Excessive valve clearance.
Weak or broken valve spring.
Worn rocker arm and rocker arm shaft. Replace.
Worn pistons.
Worn cylinder.
Carbon build-up in combustion chamber. Clean.
Worn piston pin or piston pin bore.
Worn piston rings or ring grooves.
Stretched cam chain.
Worn cam chain sprockets.
Improperly working cam chain tension
adjuster.
Worn or burnt bearing.
Big-end bearing worn or burnt.
Thrust clearance too large.
Engine General Information and Diagnosis:
Correction / Reference Item
Replace.
Replace
Repair or replace
Tighten.
See electrical section.
Adjust.
Adjust.
Clean or replace.
Clean and dry or replace.
Replace.
Replace.
Replace.
Replace.
Clean or replace.
Clean or replace.
Replace.
Clean or replace.
Clean or replace.
Clean or replace.
Replace.
Replace.
Clean or replace.
Clean.
Adjust.
Adjust.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace cam chain and sprockets.
Replace cam chain and sprockets.
Repair or replace.
Replace.
Replace.
Replace.
1A-1
B827H11104001