display YAMAHA WR 250F 2008 User Guide

6-27
STEERING
STEERING
REMOVING THE STEERINGOrder Part name Q'ty Remarks TIGHTENING STEPS:
• Tighten ring nut. 38 Nm (3.8 m•kg, 27 ft•lb)
• Loosen it one turn.
• Retighten it. 7 Nm (0.7 m•kg, 5.1 ft•lb)
Hold the machine by placing the suitable stand
under the engine. Refer to "HANDLING NOTE".
Headlight
Handlebar Refer to "HANDLEBAR" section.
Front brake hose guide
Front fender
1 Multi-function display 1
2 Multi-function display bracket 1
3 Main switch 1 Disconnect the main switch lead.
4 Steering stem nut 1
5 Front fork 2 Refer to "FRONT FORK" section.
6 Upper bracket 1
7 Steering ring nut 1 Refer to removal section.
8 Lower bracket 1

6-30
STEERING
7. Install:• Front fork "1"
• Upper bracket "2"
• Main switch "3"
• Front brake hose guide bracket
"4"
• Temporarily tighten the pinch bolts (lowerbracket).
• Do not tighten the pinch bolts (up-
per bracket)yet.
8. Install:• Guide (speed sensor lead) "1"
After installing the guide as shown,
pass the speed sensor lead through
the guide.
9. Install:• Washer "1"
• Steering stem nut "2"
10. After tightening the nut, check the steering for smooth movement. If
not, adjust the steering by loosen-
ing the steering ring nut little by lit-
tle. 11. Adjust:
• Front fork top end "a"
12. Tighten: • Pinch bolt (upper bracket) "1"
• Pinch bolt (lower bracket) "2"
Tighten the lower bracket to speci-
fied torque. If to rqued too much, it
may cause the front fork to mal-
function.
13. Install: • Multi-function display bracket "1"
• Multi-function display "2"
Pass the throttle cables "3", clutch ca-
ble "4" and hot starter cable "5" be-
tween the multi-function display
bracket and upper bracket.
14. Install: • Holder "1"
• Clamp "2"
• Install so that the marking "a" on the speed sensor lead aligns with the
holder edge.
• Fasten the speed sensor lead to the holder with the clamp.
Steering stem nut:
145 Nm (14.5 m•kg, 105
ft•lb)
Front fork top end (stan-
dard) "a":5 mm (0.20 in)
Pinch bolt (upper brack-
et): 21 Nm (2.1 m•kg, 15
ft•lb)
Pinch bolt (lower brack-
et): 21 Nm (2.1 m•kg, 15
ft•lb)
Multi-function display
bracket: 7 Nm (0.7 m•kg, 5.1
ft•lb)
Multi-function display: 4 Nm (0.4 m•kg, 2.9
ft•lb)
Holder: 13 Nm (1.3 m•kg, 9.4
ft•lb)
Clamp: 7 Nm (0.7 m•kg, 5.1
ft•lb)

7-1
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
ELECTRICAL
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
ELECTRICAL COMPONENTS1. Headlight
2. Multi-function display
3. Engine stop switch
4. Clutch switch
5. Diode
6. Starter relay diode
7. Throttle position sensor
8. Starter relay
9. Fuse
10. Starting circuit cut-off relay
11. CDI unit 12. Taillight
13. Neutral switch
14. Starter motor
15. AC magneto
16. Rectifier/regulator
17. Ignition coil
18. Spark plug
19. Start switch
20. Main switch
21. Speed sensor
22. Battery

7-2
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
WIRING DIAGRAM
1. Headlight
2. Multi-function display
3. Engine stop switch
4. Clutch switch
5. Diode
6. Starter relay diode
7. Throttle position sensor
8. Starter relay
9. Fuse
10. Starting circuit cut-off relay
11. CDI unit
12. Taillight
13. Neutral switch
14. Starter motor
15. AC magneto
16. Rectifier/regulator
17. Ignition coil
18. Spark plug
19. Start switch
20. Main switch
21. Speed sensor
22. Battery
*1: For USA
*2: Except for USACOLOR CODE
BBlack
Br Brown
Ch Chocolate
Dg Dark green
GGreen
Gy Gray
LBlue
O Orange
RRed
Sb Sky blue
WWhite
YYellow
B/L Black/Blue
B/W Black/White
L/B Blue/Black
L/R Blue/Red
L/Y Blue/Yellow
L/W Blue/White
R/B Red/Black
R/W Red/White


7

7-20
SIGNALING SYSTEM
SIGNALING SYSTEM
INSPECTION STEPS
If the speedometer will not operate, use the following inspection steps.
*1 marked: Refer to "CHECKING AND CHARGIN G THE BATTERY" section in the CHAPTER 3.
• Remove the following parts before inspection.
1. Headlight
• Use the following special tools in this inspection.
*1 Check battery. No good→Recharge or replace.
OK ↓
Check each coupler and wire connection. No good →Repair or replace.
OK ↓
Check multi-function display. (Input voltage) No good →Replace wire harness.
OK ↓
Check multi-function displa y. (Output voltage) No good →Replace multi-function display.
OK ↓
Check speed sensor. No good→Replace.
Pocket tester:
YU-3112-C/90890-03112

7-21
SIGNALING SYSTEM
CHECKING THE COUPLERS AND
LEADS CONNECTION
1. Check:• Couplers and leads connection
Rust/dust/looseness/short-circuit
→ Repair or replace.
CHECKING THE MULTI-FUNCTION
DISPLAY INPUT VOLTAGE
1. Disconnect the multi-function dis- play coupler.
2. Set the main switch to "ON".
3. Measure:
• Multi-function display input volt-age
Out of specification →Replace
wire harness.
Make sure that a short-circuit does
not develop between the terminals
because it may cause damage to
electrical components.
CHECKING THE MULTI-FUNCTION
DISPLAY OUTPUT VOLTAGE
1. Disconnect the multi-function dis- play coupler.
2. Set the main switch to "ON".
3. Measure: • Multi-function display output volt-age
Out of specification →Replace
multi-function display.
Make sure that a short-circuit does
not develop between the terminals
because it may cause damage to
electrical components.
CHECKING THE SPEED SENSOR
OUTPUT VOLTAGE
1. Insert the thin electric conductors
"1" (lead) into the speed sensor
coupler "2", as shown, and con-
nect the tester to them.
• Do not insert the electric conduc-tors more than required because
it may reduce the waterproof
function of the coupler.
• Make sure that a short-circuit does not develop between the
terminals because it may cause
damage to electrical compo-
nents.
2. Set the main switch to "ON".
3. Measure:
• Speed sensor output voltageOutput voltage not correct →Re-
place the speed sensor.
Measurement steps:
a. Elevate the front wheel and slowly
rotate it.
b. Measure the voltage (DCV) of white lead and black lead. With
each full rotation of the front
wheel, the voltage reading should
cycle from 0.6 V to 4.8 V to 0.6 V
to 4.8 V.
Tester (+) lead →Brown lead "1"
Tester (-) lead →Black lead "2"
Multi-func- tion dis-
play input voltage Tester se-
lector posi- tion
10 V or more DCV-20
Tester (+) lead →Red lead "1"
Tester (-) lead →Black/White lead
"2"
Multi-func-tion dis-
play output
voltage Tester se-
lector posi- tion
4.5 V or more DCV-20
Tester (+) lead
→White lead "3"
Tester (-) lead →Black lead "4"