8-2
INCORRECT ENGINE IDLING SPEED/POOR MEDIUM AND-
HIGH-SPEED PERFORMANCE/FAULTY GEAR SHIFTING
TRBL
SHTG
EAS00846
INCORRECT ENGINE IDLING SPEED
ENGINE
Cylinders and cylinder head
Incorrect valve clearance
Damaged valve train components
Air filter
Clogged air filter element
FUEL SYSTEM
Carburetors
Faulty starter plunger
Loose or clogged pilot jet
Loose or clogged pilot air jet
Damaged or loose carburetor joint
Incorrectly synchronized carburetors
Incorrectly adjusted engine idling speed
(throttle stop screw)
Incorrect throttle cable free play
Flooded carburetor
ELECTRICAL SYSTEMS
Battery
Faulty battery
Discharged battery
Spark plugs
Incorrect spark plug gap
Incorrect spark plug heat range
Fouled spark plug
Worn or damaged electrode
Worn or damaged insulator
Faulty spark plug cap
Ignition coils
Broken or shorted primary or secondary coils
Faulty spark plug lead
Damaged ignition coil
Ignition system
Faulty ignition unit
Faulty pickup coil
EAS00848
POOR MEDIUM-AND-HIGH-SPEED PERFORMANCE
Refer to “STARTING PROBLEMS”.
ENGINE
Air filter
Clogged air filter element
FUEL SYSTEM
Carburetors
Faulty diaphragm
Incorrect fuel level
Loose or clogged main jet
EAS00850
FAULTY GEAR SHIFTING
SHIFTING IS DIFFICULT
Refer to “CLUTCH DRAGS”.
SHIFT PEDAL DOES NOT MOVE
Shift shaft
Incorrectly adjusted shift rod
Bent shift shaft
Shift drum and shift forks
Foreign object in a shift drum groove
Seized shift fork
Bent shift fork guide bar
Transmission
Seized transmission gear
Foreign object between transmission gears
Incorrectly assembled transmission
JUMPS OUT OF GEAR
Shift shaft
Incorrect shift pedal position
Incorrectly returned stopper lever
Shift forks
Worn shift fork
Shift drum
Incorrect axial play
Worn shift drum groove
Transmission
Worn gear dog
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