Engine - Yamaha WR250F Owner's Service Manual

Carburetor:
Type/manufacturer
I. D. mark
Main jet (M.J)
Main air jet (M.A.J)
Jet needle (J.N)
Cutaway (C.A)
Pilot jet (P.J)
Pilot air jet (P.A.J)
Pilot outlet (P.O)
Bypass (B.P)
Valve seat size (V.S)
Starter jet (G.S)
Leak jet (Acc.P)
Float height (F.H)
Engine idle speed
Intake vacuum
Hot starter lever free play
Lubrication system:
Oil filter type
Oil pump type
Tip clearance
Side clearance
Housing and rotor clearance
Cooling:
Radiator core size
Width
Height
Thickness
Radiator cap opening pressure
Radiator capacity (total)
Water pump
Type
Item
MAINTENANCE SPECIFICATIONS
Standard
FCR-MX37/KEIHIN
5UME E0
#170
#115
NJRU
1.5
#42
#70
ø0.9
ø1.0
ø3.8
#68
#70
8 mm (0.31 in)
1,750–1,950 r/min
31.3–36.7 kPa (235–275 mmHg, 9.25–
10.83 inHg)
3–6 mm (0.12–0.24 in)
Paper type
Trochoid type
0.12 mm or less (0.0047 in or less)
0.09–0.17 mm (0.0035–0.0067 in)
0.03–0.10 mm (0.0012–0.0039 in)
120.2 mm (4.73 in)
240 mm (9.45 in)
22 mm (0.87 in)
2
110 kPa (1.1 kg/cm
0.54 L (0.48 Imp qt, 0.57 US qt)
Single-suction centrifugal pump
2-8
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0.20 mm (0.008
in)
0.24 mm (0.009
in)
0.17 mm
(0.0067 in)
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, 15.6 psi) ----
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Limit