Overheating Or Over Cooling; Overheating; Over Cooling - Yamaha YP250 Service Manual

YP905000

OVERHEATING OR OVER COOLING

OVERHEATING

Ignition system
D Improper spark plug gap
D Improper spark plug heat range
DFaulty ignitor unit
Fuel system
D Improper carburetor setting
D Improper fuel level adjustment
D Clogged air cleaner element
Compression system
D Heavy carbon deposit build-up
D Improperly adjusted valve timing
D Improperly adjusted valve clearance
Engine oil
D Incorrect engine oil level
D Improper engine oil quality (High viscosity)
D Low engine oil quality
Brakes
D Dragging brake
Cooling system
D Inoperative fan motor
D Faulty thermostat
D Faulty thermo switch
D Incorrect coolant level (low coolant level)
D Faulty radiator (Clogged, damage)
D Faulty radiator cap
D Impeller shaft gear malfunction (bent dowel
pin, gear)
D Damaged impeller shaft
D Disconnected fan motor connector
OVERHEATING OR OVER COOLING
9-5

OVER COOLING

Cooling system
D Faulty cooling fan
D Faulty thermostat
D Faulty thermo switch
TRBL
SHTG