Yamaha YZ250F 2016 Service Manual

8
ELECTRICAL SYSTEM
IGNITION SYSTEM ..........................................................................................8-2
CIRCUIT DIAGRAM ...................................................................................8-2
TROUBLESHOOTING ...............................................................................8-4
CHARGING SYSTEM.......................................................................................8-6
CIRCUIT DIAGRAM ...................................................................................8-6
TROUBLESHOOTING ...............................................................................8-8
FUEL INJECTION SYSTEM...........................................................................8-10
CIRCUIT DIAGRAM .................................................................................8-10
YAMAHA DIAGNOSTIC TOOL ................................................................8-12
TROUBLESHOOTING DETAILS .............................................................8-13
FUEL PUMP SYSTEM....................................................................................8-32
CIRCUIT DIAGRAM .................................................................................8-32
TROUBLESHOOTING .............................................................................8-34
ELECTRICAL COMPONENTS.......................................................................8-36
CHECKING THE SWITCHES ..................................................................8-38
CHECKING THE IGNITION SPARK GAP................................................8-41
CHECKING THE SPARK PLUG CAP ......................................................8-41
CHECKING THE IGNITION COIL ............................................................8-41
CHECKING THE CRANKSHAFT POSITION SENSOR...........................8-42
CHECKING THE ECU..............................................................................8-43
CHECKING THE STATOR COIL .............................................................8-43
CHECKING THE RECTIFIER/REGULATOR ...........................................8-43
CHECKING THE COOLANT TEMPERATURE SENSOR........................8-44
CHECKING THE THROTTLE POSITION SENSOR ................................8-44
CHECKING THE THROTTLE POSITION SENSOR INPUT VOLTAGE ..8-45
CHECKING THE INTAKE AIR PRESSURE SENSOR ............................8-46
CHECKING THE INTAKE AIR TEMPERATURE SENSOR .....................8-46
CHECKING THE NEUTRAL SWITCH .....................................................8-46
CHECKING THE FUEL INJECTOR .........................................................8-47

Yamaha YZ250F 2016 Specifications

General

Displacement	250cc
Bore x Stroke	77.0mm x 53.6mm
Compression Ratio	13.5:1
Ignition	TCI
Transmission	5-speed
Final Drive	Chain
Suspension Rear	KYB® single shock; fully adjustable, 12.4-in travel
Brakes Front	Hydraulic single disc brake, 250mm
Brakes Rear	Hydraulic single disc brake, 245mm
Tires Front	80/100-21
Tires Rear	100/90-19
Length	85.6 in
Width	32.5 in
Seat Height	38.0 in
Rake (Caster Angle)	27.3°
Ground Clearance	12.8 in
Fuel Capacity	2.0 gal
Engine Type	Liquid-cooled, DOHC, 4-stroke, 4-valve
Fuel Delivery	Yamaha Fuel Injection (YFI), Keihin® 44mm
Suspension Front	KYB® Speed-Sensitive System, inverted fork; fully adjustable, 12.2-in travel