Sym Wolf SB 250 Ni Service Manual page 17

1. General Information
Troubleshooting
A. Engine cannot be started or difficult to be started
Check and adjustment
Press the fuel injector feed
pipe and confirm whether
there is fuel in the feed pipe
The fuel supply to the fuel
injector is sufficient
Check the spark plug ignition
condition
Sparks
Perform cylinder compression
pressure test
Normal cylinder
compression pressure
Restart the engine
No ignition
Remove and check the spark
plug
Dry spark plug
1-12
Fault condition
The fuel injector is not
supplied with sufficient fuel
Week sparks or no spark
Low or no compression
pressure
With signs of ignition but
the engine cannot be
started
Wet spark plug
Probable causes
1.
Check the fuel amount in the fuel tank
2.
Check if the fuel pipe and the vacuum
tube are blocked or not
3.
Malfunction of fuel pump relay or wiring
4. Evaporative Emission Control System
clogged
5.
Malfunction of fuel pump
6.
The fuel strainer is blocked or not
1.
Malfunction of spark plug
2.
Spark plug contamination
3.
Malfunction of ECU
4.
Malfunction of the AC Generator
5.
Ignition coil is in open or short circuit
6. Ignition coil shorted or open circuit
7.
Malfunction of main switch
1.
Piston ring seized
2.
Malfunction of cylinder valves
3.
Worn cylinder and piston ring
4.
Cylinder gasket leakage
5.
Sand hole in the compression parts
1.
Malfunction of throttle valve operation
2.
Air sucked into intake manifold
3.
Incorrect ignition timing
1.
Contaminated or clogged fuel injector
2.
Malfunction of throttle valve operation
3.
Malfunction of fuel pressure regulator