Hisun HS250UTV - Compression System

-284-
TROUBLESHOOTING
- 284 -
Starter motor
1、Faulty starter motor
2、Faulty starter relay
3、Faulty overrunning clutch in engine
4、Broken main switch
5、Broken main fuse
Battery
1、Low battery voltage
2、Faulty battery
COMPRESSION SYSTEM
Cylinder and cylinder head
1、Loose spark plug
2、Loose cylinder head or cylinder
3、Broken cylinder head gasket
4、Broken cylinder gasket
5、Worn, damaged or seized cylinder
Piston and piston rings
1、Improperly installed piston ring
2、Worn, fatigued or broken piston ring
3、Seized piston ring
4、Seized or damaged piston
Valve, camshaft and crankshaft
1、Improperly sealed valve
2、Improperly contacted valve and valve seat
3、Improper valve timing
4、Broken valve spring
5、Seized camshaft
Crankcase and crankshaft
1、Improperly seated crankcase
2、Seized crankshaft
Valve train
1、Improperly adjusted valve clearance
2、Improperly adjusted valve timing
POOR IDLE SPEED PERFORMANCE
POOR IDLE SPEED PERFORMANCE
EFI system
1、Broken ECU
2、Clogged nozzle or the rupture the line from nozzle to ECU
3、Damage of engine speed signal sensor
4、Rupture of the line from engine speed signal sensor to ECU
5、Broken inlet pressure or temperature sensor or damaged line to ECU
6、Broken air throttle or damage line to ECU.
7、Broken vice line (cable) of electrical injection
TROUBLESHOOTING
- 285 -
Electrical system
1、Faulty ignition plug
2、The performace of speed sensor become poor
3、Faulty ignition coil
Valve train Improperly adjusted valve clearance
Air filter Clogged air filter element
POOR MEDIUM AND HIGH-SPEED PERFORMANCE
POOR MEDIUM AND HIGH-SPEED PERFORMANCE
EFI system
1、 Broken ECU
2、 The performance of speed signal sensor become poor
3、 The main nozzle clog or loose
4、 Spoiled or pollute oil
5、 Broken inlet pressure / temperature sensor
6、 Air throttle position sensor loose
Air filter
Clogged air filter element
Muffler Clogged muffler
Set out
The reverse signal error trigger
FAULTY GEAR SHIFTING
SHIFT LEVER DOES NOT MOVE
Shift drum, shift forks
1、Groove jammed with impurities
2、Seized shift fork
3、Bent shift fork guide bar
4、
Broken shift guide
Transmission
1、Seized transmission gear
2、Incorrectly assembled transmission
Shift guide
1、Broken shift guide mechanism
2、Broken shift flexible shaft
JUMPS OUT OF GEAR
Shift forks Worn shift fork
Shift drum
1、Improper thrust play
2、Worn shift drum groove
Transmission Worn gear dog