Yamaha BR250F Service Manual page 80

Crankshaft:
Crankshaft assembly width (A)
Crankshaft deflection (0)
Connecting rod big end side clearance (C)
Connecting rod small end deflection
(P)
+
0 (
20
+
0.039
in]
56 _
0.05
mm 2.
0.00197
In
0.02 mm (0.0008 in)
0.25 -- 0.75 mm (0.010 -- 0.030 in)
2.0 mm (0.079 in)
A
D
rc1
D
CLUTCH SIDE
c:t{r
I~
100 mm (3.9 in)l--~11-ooc--l80 mm (3.1 in)
Crank pin outside diameter
x
length
Crank pin type
Crank bearing type (Left) x q'ty
Crank bearing type (Right) x
q'tv
Crank oil seal type (Left) x q'ty
Crank oil seal type (Right) x
q'tv
Carburetor:
Type & manufacturer/quantity
1.0. Mark
Main jet (M.J.)
Pilot screw (P.S.)
Throttle valve (Th.V.)
Valve seat (V.S.)
Float height
Idling engine speed
Lubrication:
Autolube pump - Color code
Autolube pump - Minimum stroke
Autolube pump - Maximum stroke
Autolube pump - Reduction ratio
Autolube pump - Output Min./200 strokes
Autolube pump Output Max./200 strokes
Autolube pump wire free play
Oil tank capacity
Oil grade
C. Drive and track suspencion
Transmission:
Type
Drive ratio
Engagement rpm
Shift rpm
Primary spring:
Part No.
Color code
1>24
x
55 mm (1)0.945
x
2.165 in)
Solid shaft
#6306 special x 1
pc.
#6305 special x 1 pc,
S03-30 x 1 pc,
505-25 x 1 pc,
B032-28 KEIHIN x 1 pc,
8R401
#108
1-1/4 turns out
t;;;;
1.0
1>1.4 mm (1)0.055 in)
15 ± 2 mm (0.59 ± 0.08 in)
1100
±
100 r/rnin
Pink
0.20 -- 0.25 mm (0.0079 -- 0.0098 in)
1.65 -- 1.87 mm (0.0650 -- 0.0736 in)
1/40
0.95 -- 1.19 crrr' (0.0321 -- 0.0402 oz)
7.84'" 8.89
ern"
(0.2508 -- 0.3006oz)
25
±
1 mm (0.98
±
0.04 in) at idle
1.75
YAMALUBE 2-cycle
V-belt automatic centrifugal engagement
3.5: 1 ,..., 1 : 1
3100
±
200 r/min
5,700 -- 5,800 r/min
90501-50654
No painted
7-2