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9-20C
TIGHTENING TORQUES - ENGINE
Flange bolts - cylinder-head M 8 35 Nm (25 ft.lb)
Nuts-cylinder base M 10 35 Nm (25 ft.lb)
Flywheel collar nut M 12x1 60 Nm (44 ft.lb)
Nut for primary sprocket (LH thread) M 18x1.5 Loctite 243 150 Nm (110 ft.lb)
Nut for inner clutch hub M 18x1.5 Loctite 243 100 Nm (74 ft.lb)
Crankcase and cover bolts M 6 8 Nm (6 ft.lb)
Swingarm pivot M 14 100 Nm (74 ft.lb)
Flat head bolt release plate kickstarter M 6x16 Loctite 648 19 Nm (14 ft.lb)
Other bolts M 6 10 Nm (7 ft.lb)
M 8 25 Nm (19 ft.lb)
M 10 45 Nm (33 ft.lb)
Piston fitting clearance 0.06 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
Transmission shafts end float 0.1–0.2 mm
Clutch springs - length Ø 2.5 new = 43 mm, minimum length = 42 mm
TOLERANCES AND FITTING CLEARANCES
GASKET THICKNESSES
Crankcase 0.5 mm
Clutch cover 0.5 mm
Cylinder bottom gasket as required
Available cylinder bottom gaskets 0.2/0.4/0.5/0.75 mm
Cylinder-head gasket O-rings
250 SX 250 MXC, EXC
BASIC CARBURETOR SETTING
Keihin PWK 38 AG PJ
010300
172 (170,175)
48 (45,50)
85
NOZ E (NOZ F)
III
7
1,5
–
55
Keihin PWK 38 AG
030300
178 (175,180)
45 (48)
85
NOZ G (NOZ H)
IV
6,5
1,5
–
–
300 MXC, EXC
Keihin PWK 38 AG
050300
175 (172,178)
45 (48)
85
NOZ H (NOZ I)
III
6,5
1,5
–
–
380 SX, MXC, EXC
Keihin PWK 38 AG
070300
170 (168,172)
45 (48)
85
NOZ G (NOZ I/NOZ H)
III
6,5
1,5
–
–
Carburetor
Carburetor setting number
Main jet
Idling jet
Starting jet
Jet needle
Needle position from top
Slide
Air adjustment screw open
Performance restrictor
Power jet jet