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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
• Dam aged valve train com ponents
Air filter
• Clogged air filter elem ent
FUEL SYSTEM
Carburetors
• Faulty starter plunger
• Loose or clogged pilot jet
• Loose or clogged pilot air jet
• Dam aged or loose carburetor joint
• Incorrectly synchronized carburetors
• Incorrectly
adjusted
speed (throttle stop screw )
• Incorrect throttle cable free play
• Flooded carburetor
EB902000
POOR M EDIUM -AND-HIGH-SPEED PERFORM ANCE
Refer to " STARTING PROBLEM S" .
ENGINE
Air filter
• Clogged air filter elem ent
EB903000
FAULTY GEAR SHIFTING
SHIFTING IS DIFFICULT
Refer to " CLUTCH DRAGS" .
SHIFT PEDAL DOES NOT M OVE
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 transm ission gear
• Foreign object betw een transm ission
gears
• Incorrectly assem bled transm ission
engine
idling
9 - 2
ELECTRICAL SYSTEM S
Battery
• Faulty battery
• Discharged battery
Spark plugs
• Incorrect spark plug gap
• Incorrect spark plug heat range
• Fouled spark plug
• Worn or dam aged electrode
• Worn or dam aged insulator
• Faulty spark plug cap
Ignition coils
• Broken or shorted prim ary or second-
ary coils
• Faulty spark plug lead
• Dam aged ignition coil
Ignition system
• Faulty ignitor unit
• Faulty pickup coil
FUEL SYSTEM
Carburetors
• Faulty diaphragm
• Incorrect fuel level
• Loose or clogged m ain jet
Fuel pump
• Faulty fuel pum p
JUM PS 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
TRBL
SHTG
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Table of Contents
Troubleshooting
