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Starting failure/hard starting
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ENGINE ELECTRICAL SYSTEMS
Cylinder(s) and cylinder head Battery
• Loose spark plug • Discharged battery
• Loose cylinder head or cylinder • Faulty battery
• Damaged cylinder head gasket Fuse(s)
• Damaged cylinder gasket • Blown, damaged or incorrect fuse
• Worn or damaged cylinder • Improperly installed fuse
• Incorrect valve clearance Spark plug(s)
• Improperly sealed valve • Incorrect spark plug gap
• Incorrect valve-to-valve-seat contact • Incorrect spark plug heat range
• Incorrect valve timing • Fouled spark plug
• Faulty valve spring • Worn or damaged electrode
• Seized valve • Worn or damaged insulator
Piston(s) and piston ring(s) • Faulty spark plug cap
• Improperly installed piston ring Ignition coil
• Damaged, worn or fatigued piston ring • Cracked or broken ignition coil body
• Seized piston ring • Broken or shorted primary or secondary
• Seized or damaged piston coils
Air filter • Faulty spark plug lead
• Improperly installed air filter Ignition system
• Clogged air filter element • Faulty ECU (engine)
Crankcase and crankshaft • Faulty crankshaft position sensor
• Improperly assembled crankcase Switches and wiring
• Seized crankshaft • Faulty main switch
FUEL SYSTEM • Faulty engine stop switch
Fuel tank • Broken or shorted wiring
• Empty fuel tank • Faulty front, rear or both brake light
• Clogged fuel tank cap breather hole switches
• Deteriorated or contaminated fuel • Faulty start switch
• Clogged or damaged fuel hose • Faulty sidestand switch
Fuel pump • Improperly grounded circuit
• Faulty fuel pump • Loose connections
• Faulty fuel pump relay Starting system
Throttle body • Faulty starter motor
• Deteriorated or contaminated fuel • Faulty starter relay
• Sucked-in air • Faulty starting circuit cut-off relay
• Faulty starter clutch
9 - 1
INCORRECT ENGINE IDLING SPEED/POOR MEDIUM-
AND-HIGH-SPEED PERFORMANCE/FAULTY CLUTCH
EAS00847
TRBL
SHTG
INCORRECT ENGINE IDLING SPEED
ENGINE ELECTRICAL SYSTEMS
Cylinder(s) and cylinder head Battery
• Incorrect valve clearance • Discharged battery
• Damaged valve train components • Faulty battery
Air filter Spark plug(s)
• Clogged air filter element • Incorrect spark plug gap
FUEL SYSTEM • Incorrect spark plug heat range
Throttle body • Fouled spark plug
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• Damaged or loose throttle body joint • Worn or damaged electrode
• Improperly synchronized throttle bodies • Worn or damaged insulator
• Improperly adjusted engine idling speed • Faulty spark plug cap
(idle adjusting screw) Ignition coil(s)
• Improper throttle cable free play • Faulty spark plug lead
• Flooded throttle body Ignition system
• Faulty air induction system • Faulty ECU (engine)
• Faulty crankshaft position sensor
EAS00849
POOR MEDIUM-AND-HIGH-SPEED PERFORMANCE
Refer to “STARTING FAILURE/HARD STARTING”.
ENGINE FUEL SYSTEM
Air filter Fuel pump
• Clogged air filter element • Faulty fuel pump
Air intake system
• Clogged or leaking air duct
EAS00853
FAULTY CLUTCH
ENGINE OPERATES BUT SCOOTER WILL CLUTCH SLIPS
NOT MOVE Clutch shoe spring(s)
V-belt • Damaged, loose or worn clutch shoe spring
• Bent, damaged or worn V-belt Clutch shoe(s)
• Slipping V-belt • Damaged or worn clutch shoe
Primary pulley cam and primary pulley Primary sliding sheave
slider • Seized primary sliding sheave
• Damaged or worn primary pulley cam POOR STARTING PERFORMANCE
• Damaged or worn primary pulley slider V-belt
Clutch spring(s) • V-belt slips
• Damaged clutch spring • Oil or grease on the V-belt
Transmission gear(s) Primary sliding sheave
• Damaged transmission gear • Faulty operation
• Worn pin groove
• Worn pin
Clutch shoe(s)
• Bent, damaged or worn clutch shoe
9 - 2
TRBL
FAULTY CLUTCH/OVERHEATING/OVERCOOLING SHTG
POOR SPEED PERFORMANCE
V-belt Primary sliding sheave
• Oil or grease on the V-belt • Worn primary sliding sheave
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