Yamaha BR250F Service Manual page 139

Model
BR250TJ
Power Air Jet
(Pw.A.J.)
-
Starter Jet
(G.S.)
#
120
Valve Seat Size (V.S.)
¢
1.4
Idling Engine Speed 1,100
±
100 r/min
Float Arm Height (F.H.) 15
±
2.0 mm (a.59
±
O.OS in)
High Altitude Tuning
~
-30°C -20°C -10°C O°C 10°C 20°C
Altitude
(-22°F)
(_4°F)
(14°F)
(32.
oF)
(50°F)
(6SoF)
#105
Sea level
~
#102
-600 m
#105
(2,000 ftl
#102
"""1,200 m
#105
(4,000
ft]
#102
-1,800 m
#102
(6,000
ft) #100
-2,400 m
#102
(8,000 ttl
#100
-3,000 m
#100
(10,000
ftl
#98
Fuel Pump:
Type/Manufacturer Quantity
Diaphragm type/KEIHIN/l
Oil Pump:
Color Code
Pink
Plunger Diameter 5.5 mm (0.16 in)
Minimum Stroke 0.20 - 0.25 mm (0.0079 - 0.0098 in)
Maximum Stroke 1.65 - 1.87 mm (O.0650 - 0.0736 in)
Reduction Ratio
1/45
Minimum Output (at 200 stroke)
0.95 - 1.19 cm '
(0.033 - 0.042 Imp oz, 0.032 - 0.040 US oz)
Maximum Output (at 200 stroke)
I
7.S4 - 8.S9
crrr'
(0.276 -- 0.313 Imp oz, 0.265 - 0.301 US oz)
Pump Cable Adjustment 24""'" 26 mm (0.94 -- 1.02 in)
::d:::~~
Cool ing System:
Cooling Fan Belt Tension -
Crankcase Tightening Sequence:
1
710
3
5
0
0 0
- - -
0 0
8
~
2
0
4
.
-26-