Incorrect Engine Idling Speed; Engine; Fuel System; Electrical Systems - Yamaha YZF-R6 Service Manual

INCORRECT ENGINE IDLING SPEED/POOR MEDIUM-AND-
HIGH-SPEED PERFORMANCE/FAULTY GEAR SHIFTING
EB901000

INCORRECT ENGINE IDLING SPEED

ENGINE

Cylinders and cylinder head
S Incorrect valve clearance
S Damaged valve train components
Air filter
S Clogged air filter element

FUEL SYSTEM

Carburetors
S Faulty starter plunger
S Loose or clogged pilot jet
S Loose or clogged pilot air jet
S Damaged or loose carburetor joint
S Incorrectly synchronized carburetors
S Incorrectly adjusted engine idling speed
(throttle stop screw)
S Incorrect throttle cable free play
S Flooded carburetor
EB902000

POOR MEDIUM-AND-HIGH-SPEED PERFORMANCE

Refer to "STARTING PROBLEMS".
ENGINE
Air filter
S Clogged air filter element
Air intake system
S Clogged air ducts
EB903000

FAULTY GEAR SHIFTING

SHIFTING IS DIFFICULT

Refer to "CLUTCH DRAGS".

SHIFT PEDAL DOES NOT MOVE

Shift shaft
S Incorrectly adjusted shift rod
S Bent shift shaft
Shift drum and shift forks
S Foreign object in a shift drum groove
S Seized shift fork
S Bent shift fork guide bar
Transmission
S Seized transmission gear
S Foreign object between transmission gears
S Incorrectly assembled transmission

ELECTRICAL SYSTEMS

Battery
S Faulty battery
S Discharged battery
Spark plugs
S Incorrect spark plug gap
S Incorrect spark plug heat range
S Fouled spark plug
S Worn or damaged electrode
S Worn or damaged insulator
S Faulty spark plug cap
Ignition coils
S Broken or shorted primary or secondary coils
S Faulty spark plug lead
S Damaged ignition coil
Ignition system
S Faulty ignition unit
S Faulty pickup coil
FUEL SYSTEM
Carburetors
S Faulty diaphragm
S Incorrect fuel level
S Loose or clogged main jet
Fuel pump
S Faulty fuel pump

JUMPS OUT OF GEAR

Shift shaft
S Incorrect shift pedal position
S Incorrectly returned stopper lever
Shift forks
S Worn shift fork
Shift drum
S Incorrect axial play
S Worn shift drum groove
Transmission
S Worn gear dog
9-2
TRBL
SHTG