Yamaha YP250 Mobility Scooter User Manual


 
9-5
OVERHEATING OR OVER COOLING
TRBL
SHTG
YP905000
OVERHEATING OR OVER COOLING
OVERHEATING
Ignition system
S Improper spark plug gap
S Improper spark plug heat range
SFaulty ignitor unit
Fuel system
S Improper carburetor setting
S Improper fuel level adjustment
S Clogged air cleaner element
Compression system
S Heavy carbon deposit build-up
S Improperly adjusted valve timing
S Improperly adjusted valve clearance
Engine oil
S Incorrect engine oil level
S Improper engine oil quality (High viscosity)
S Low engine oil quality
Brakes
S Dragging brake
Cooling system
S Inoperative fan motor
S Faulty thermostat
S Faulty thermo switch
S Incorrect coolant level (low coolant level)
S Faulty radiator (Clogged, damage)
S Faulty radiator cap
S Impeller shaft gear malfunction (bent dowel
pin, gear)
S Damaged impeller shaft
S Disconnected fan motor connector
OVER COOLING
Cooling system
S Faulty cooling fan
S Faulty thermostat
S Faulty thermo switch