Troubleshooting; Starting Failures; Engine; Fuel System - Yamaha YZF-R1S Service Manual

EAS00844
NOTE:
The following guide for troubleshooting does not cover all the possible causes of trouble. It should be
helpful, however, as a guide to basic troubleshooting. Refer to the relative procedure in this manual for
checks, adjustments, and replacement of parts.

STARTING FAILURES

ENGINE

Cylinder(s) and cylinder head(s)
S Loose spark plug
S Loose cylinder head or cylinder
S Damaged cylinder head gasket
S Damaged cylinder gasket
S Worn or damaged cylinder
S Incorrect valve clearance
S Improperly sealed valve
S Incorrect valve-to-valve-seat contact
S Incorrect valve timing
S Faulty valve spring
S Seized valve
Piston(s) and piston ring(s)
S Improperly installed piston ring
S Damaged, worn or fatigued piston ring
S Seized piston ring
S Seized or damaged piston
Air filter
S Improperly installed air filter
S Clogged air filter element
Crankcase and crankshaft
S Improperly assembled crankcase
S Seized crankshaft

ELECTRICAL SYSTEMS

Battery
S Discharged battery
S Faulty battery
Fuse(s)
S Blown, damaged or incorrect fuse
S Improperly installed fuse
Spark plug(s)
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
STARTING FAILURES

TROUBLESHOOTING

FUEL SYSTEM

Fuel tank
S Empty fuel tank
S Clogged fuel filter
S Clogged fuel strainer
S Clogged fuel tank drain hose
S Deteriorated or contaminated fuel
Fuel pump
S Faulty fuel pump
S Faulty fuel pump relay
Throttle body (-ies)
S Deteriorated or contaminated fuel
S Sucked-in air
Ignition coil(s)
S Cracked or broken ignition coil body
S Broken or shorted primary or secondary
coils
Ignition system
S Faulty ECU
S Faulty crankshaft position sensor
9-1
TRBL
SHTG