Poor Idle Speed Performance; Poor Medium And High Speed Performance - Yamaha Libero Workshop Manual

L-204
IGNITION SYSTEM
Spark Plug
• Improper Plug gap
• Worn Electrodes
• Wire between Terminals broken
• Improper heat range
• Faulty Spark Plug Cap
Ignition Coil
• Broken or shorted Primary /Secondary Coil
• Faulty High Tension Cord
• Broken Ignition Coil body
Carburetor
• Improperly returned Starter Plunger
• Loose or clogged Pilot jet
• Damaged Carburetor Joint
• Improperly tightened Carburetor Joint Clamp
hose
• Improperly adjusted idle speed (Pilot Screw)
, (Throttle stop Screw)
• Improperly adjusted Throttle Cable
• Flooded Carburetor
Refer to "STARTING FAILURE/HARD STARTING'' section. (Fuel system, electrical system,
compression system and valve system Page no 8-1)
Carburetor
• Improperly adjusted Fuel Level
• Clogged main Nozzle
• Clogged or loose Pilot jet

POOR IDLE SPEED PERFORMANCE

POOR IDLE SPEED PERFORMANCE

POOR MEDIUM AND HIGH SPEED PERFORMANCE

Ignition system
• Faulty C.D.I Unit
• Faulty Sensor Coil
• Broken Magneto Woodruff Key
Switch
• Faulty Main Switch
Wiring
• Loose Coupler connection
• Improperly grounded
• Broken Wireharness
R. R. Unit
• Faulty R. R. Unit
Air Filter
• Clogged air filter element
Ignition system
• Faulty Spark Plug
• Faulty High tension Cord
• Faulty C. D. I. Unit
• Faulty Sensor up Coil
• Faulty Ignition Coil
Valve system
• Improperly adjusted Valve clearance
Air Filter
• Clogged Air Filter Element
8-2
TRBL
SHTG