Hisun HS800UTV - Poor Medium and High-Speed Performance; Faulty Gear Shifting; Shift Lever Does Not Move; Jumps out of Gear

TROUBLESHOOTING
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Air filter Clogged air filter element
POOR MEDIUM AND HIGH-SPEED PERFORMANCE
POOR MEDIUM AND HIGH-SPEED PERFORMANCE
Carburetor 1、Improper jet needle clip position
2、Improperly adjusted fuel level
3、Clogged or loose main jet
4、Deteriorated or contaminated fuel
Air filter Clogged air filter element
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 Seized transmission gear
Incorrectly assembled transmission
Shift guide Shift guide
JUMPS OUT OF GEAR
Shift forks Worn shift fork
Shift drum Improper thrust play
Worn shift drum groove
Transmission Worn gear dog
OVERHEATING
OVERHEATING
Ignition system 1、Improper spark plug gap
2、Improper spark plug heat range
3、Faulty C.D.I. unit
Fuel system 1、Improper carburetor main jet (improper setting)
2、Improper fuel level
3、Clogged air filter element