Yamaha YP400T Service Manual page 16

INCORRECT ENGINE IDLING SPEED........................................................... 9-2
ENGINE..................................................................................................... 9-2
FUEL SYSTEM.......................................................................................... 9-2
ELECTRICAL SYSTEMS ..........................................................................9-2
POOR MEDIUM-AND-HIGH-SPEED PERFORMANCE .................................9-3
ENGINE..................................................................................................... 9-3
FUEL SYSTEM.......................................................................................... 9-3
FAULTY CLUTCH ........................................................................................... 9-3
ENGINE OPERATES BUT SCOOTER WILL NOT MOVE........................9-3
CLUTCH SLIPS......................................................................................... 9-3
POOR STARTING PERFORMANCE........................................................9-3
POOR SPEED PERFORMANCE.............................................................. 9-3
OVERHEATING............................................................................................... 9-4
ENGINE..................................................................................................... 9-4
COOLING SYSTEM .................................................................................. 9-4
FUEL SYSTEM.......................................................................................... 9-4
CHASSIS...................................................................................................9-4
ELECTRICAL SYSTEMS ..........................................................................9-4
OVERCOOLING .............................................................................................. 9-4
COOLING SYSTEM .................................................................................. 9-4
POOR BRAKING PERFORMANCE................................................................9-5
FAULTY FRONT FORK LEGS........................................................................ 9-5
LEAKING OIL ............................................................................................ 9-5
MALFUNCTION......................................................................................... 9-5
UNSTABLE HANDLING.................................................................................. 9-5
FAULTY LIGHTING OR SIGNALING SYSTEM..............................................9-6
HEADLIGHT DOES NOT COME ON ........................................................9-6
HEADLIGHT BULB BURNT OUT.............................................................. 9-6
TAIL/BRAKE LIGHT DOES NOT COME ON ............................................9-6
TAIL/BRAKE LIGHT BULB BURNT OUT.................................................. 9-6
TURN SIGNAL DOES NOT COME ON .................................................... 9-6
TURN SIGNAL BLINKS SLOWLY............................................................. 9-6
TURN SIGNAL REMAINS LIT...................................................................9-6
TURN SIGNAL BLINKS QUICKLY............................................................ 9-6
HORN DOES NOT SOUND ...................................................................... 9-6