Yamaha YZ250F 2016 Service Manual

ELECTRICAL COMPONENTS
8-47
EAS1SM9347
CHECKING THE FUEL INJECTOR
1. Remove:
• Fuel injector
Refer to “THROTTLE BODY” on page 7-5.
2. Check:
• Fuel injector resistance
Out of specification  Replace.
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a. Disconnect the fuel injector coupler from the
fuel injector.
b. Connect the pocket tester ( 10) to the
fuel injector coupler.
c. Measure the fuel injector resistance.
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Continuity
Positive tester probe 
Sky blue “1”
Negative tester probe 
Sensor terminal “a”
Continuity
Positive tester probe 
Pink “2”
Negative tester probe 
Sensor terminal “b”
Continuity
Positive tester probe 
Pink “2”
Negative tester probe 
Sensor terminal “c”
Continuity
Positive tester probe 
Yellow/white “3”
Negative tester probe 
Sensor terminal “d”
Continuity
Positive tester probe 
Yellow/white “3”
Negative tester probe 
Sensor terminal “e”
Continuity
Positive tester probe 
Yellow/white “3”
Negative tester probe 
Sensor terminal “f”
Resistance
12 
cba
Y/W
P
Sb
d
e
f
3
1
2
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe 
Injector terminal “1”
• Negative tester probe 
Injector terminal “2”
12

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