Sym PA12B User Manual

To this chapter contents
1. General Information
B. Engine run sluggish (Speed does not pick up, lack of power)
1-14
Check and adjustment Fault condition Possible causes
Try gradual acceleration and
check engine speed
Engine speed increases.
1. Air cleaner clogged
2. Poor fuel supply
3. Lines in fuel tank evaporation system
clogged
4. Exhaust pipe clogged
5. Fuel level too low in carburetor
6. Fuel nozzle clogged in carburetor.
Check ignition timing
(Using ignition lamp)
Engine speed cannot
increase.
Check cylinder compression
pressure (using compression
pressure gauge)
Ignition timing correct Incorrect ignition timing
Compression pressure
correct
1. Malfunction of CDI
2. Malfunction of AC alternator
No compression pressure
Check if carburetor jet is
clogged
No clogged
1. Remove foreign
1. Cylinder & piston ring worn out
2. Cylinder gasket leaked
3. Sand hole in compression parts
4. Valve deterioration
5. Seized piston ring
Remove spark plug
Check if engine over heat
No foul or discoloration Fouled and discoloration
No knock Knock
1. Remove dirt
2. Incorrect spark plug heat range
1. Piston and cylinder worn out
2. Lean mixture
3. Poor fuel quality
4. Too much carbon deposited in
combustion chamber
5. Ignition timing too advanced
6. Poor circuit on the cooling system
Normal Engine overheat
Continually drive in
acceleration or high speed
1. Too much carbon deposited in
combustion chamber
2. Lean mixture
3. Poor fuel quality
4. Ignition timing too advanced
Clogged

Sym PA12B Specifications

General

Brand	Sym
Model	PA12B
Category	Motorcycle
Language	English