KTM 250 1998, Repair Manual

Page: 52 / 59

8
5
Piston fitting clearance
0.05 mm (250) 0.06 mm (300) 0.08 mm (380)
Piston ring end gap
0.3
–
0.4 mm
Connecting rod bearing - radial clearance
0.021
–
0.032 mm
T
ransmission shafts end float
0.1
–
0.2 mm
Clutch springs - length
Ø 2.5 new = 43 mm, minimum length = 42 mm
8.2 TOLERANCES AND FITTING CLEARANCES
8.4 GASKET THICKNESSES
8.3 TIGHTENING TORQUES
Flange bolts - cylinder
-head
M
8
35 Nm (25 ft.lb)
Nuts-cylinder base
M 1
0
35 Nm (25 ft.lb)
Flywheel collar nut
M 1
2
x1
60 Nm (45 ft.lb)
Nut for primary sprocket (LH thread)
M 1
8
x1
.5
150 Nm (110 ft.lb)
Nut for inner clutch hub
M 1
8
x1
.5
100 Nm (75 ft.lb)
Crankcase and cover bolts
M 6
8
Nm (6 ft.lb)
Swingarm pivot
M 1
4
1
00 Nm (103 ft.lb)
Collar nut rear wheel spindle
M 20
x1
.5
80 Nm (60 ft.lb)
Other screws
M 6
10 Nm (8 ft.lb)
M 8
30 Nm (22 ft.lb)
M 10
50 Nm (37 ft.lb)
Crankcase
0.5 mm
Clutch cover
0.5 mm
Cylinder bottom gasket
as required
A
vailable cylinder bottom gaskets
0.2/0.4/
0
.5
/
0.7 mm
Cylinder
-head gasket
O-rings
TA BL E 3
8.5 BASIC CARBURETOR SETTING
Carburetor Carburetor setting number Main jet Idling jet Starting jet Jetneedle Needle position from top Throttle valve Air adjustment screw open
380 SX/MXC/EXC
USA
250 SX/MXC/EXC USA
300 MXC/EXC USA
Keihin PWK 38
240496
175 (170/180)
45 (42/48)
85
N85C (N85D)
III
6
1,5
Keihin PWK 38
200597
175 (165/170/180)
45 (42/48)
85
NOZG (NOZH)
III
6
1,5