Hartford Industrial Co., Ltd.
NO
CG
3.Reason a breakdown
Page
3-2
3.2 Engine output poor
Possible cause
Possible reason
Check
Check carburetor
No fault with performance
Test acceleration and
high speed running
Carburetor blocked or
faulty
Compression pressure
low
Compression pressure normal
Test idle
Engine idles
Engine won’t idle
Ignition timing correct
Ignition timing
incorrect
Carburetor normal
Test cylinder compression
Check ignition timing
Vehicle does not
accelerate in gear
Start engine
1.Air filter blocked
2.Fuel delivery insufficient
3.Fuel cap vent blocked
4.Exhaust blocked
1.Clutch slipping
2.Clutch face damaged or faulty
3.Clutch plates damaged or faulty
1.CDI unit faulty
2.AC generator faulty
1.Cylinder or piston rings excessively
worn
2.Gasket leaking or damaged
3.Decompressor leaking or cracked
4.Piston rings scored or damaged
1.Jet blocked
2.Carburetor incorrectly installed
3.Carburetor incorrectly adjusted
1.Piston or cylinder worn or damaged
2.Fuel mixture too weak
3.Fuel line faulty
4.Combustion chamber carbon
deposits excessive
5.Ignition timing overly retarded
6.Clutch slipping
1.Combustion chamber carbon
deposits excessive
2.Fuel line faulty
3.Clutch slipping
4.Fuel mixture too weak
5.Ignition timing overly advanced
No overheating
Check engine for
overheating
Spark plug discolored
Remove and inspect
spark plug
Overheating
1.Spark plug fouled or worn (replace
spark plug)
2.Clean deposits
3.Spark plug heat range incorrect
4.Spark plug gap incorrect
Poor performance
No discoloration