User Guide
9 - 2
TRBL
SHTG
INCORRECT ENGINE IDLING SPEED/POOR MEDIUM-AND-
HIGH-SPEED PERFORMANCE/FAULTY GEAR SHIFTING
EB901000
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 second-
ary coils
• Faulty spark plug lead
• Damaged ignition coil
Ignition system
• Faulty ignitor unit
• Faulty pickup coil
EB902000
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
Fuel pump
• Faulty fuel pump
EB903000
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