Yamaha YZ250F X 2008, Owner'S Service Manual

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2-7
MAINTENANCE SPECIFICATIONS
Quantity 8 ----
Warp limit ---- 0.1 mm (0.004
in)
Clutch spring free length 35.7 mm (1.41 in) 34.7 mm (1.37
in)
Quantity 5 ----
Clutch housing thrust clearance 0.10–0.35 mm (0.0039–0.0138 in) ----
Clutch housing radial clearance 0.010–0.044 mm (0.0004–0.0017 in) ----
Clutch release method Inner push, cam push ----
Shifter:
Shifter type Cam drum and guide bar ----
Guide bar bending limit ---- 0.05 mm (0.002
in)
Kickstarter:
Type Kick and ratchet type ----
Carburetor:
Type/manufacturer FCR-MX37/KEIHIN ----
I. D. mark 5XCL L0 ----
Main jet (M.J) #178 ----
Main air jet (M.A.J) ø2.0 ----
Jet needle-clip position (J.N) NFPR-5 ----
Cutaway (C.A) 1.5 ----
Pilot jet (P.J) #42 ----
Pilot air jet (P.A.J) #105 ----
Pilot outlet (P.O) ø0.9 ----
Pilot screw (example) (P.S) 2-3/8 ----
Bypass (B.P) ø1.0 ----
Valve seat size (V.S) ø3.8 ----
Starter jet (G.S) #72 ----
Leak jet (Acc.P) #70 ----
Float height (F.H) 8 mm (0.31 in) ----
Engine idle speed 1,900–2,100 r/min ----
Intake vacuum 29.3–34.7 kPa (220–260 mmHg, 8.66–
9.45 inHg) ----
Hot starter lever free play 3–6 mm (0.12–0.24 in) ----
Lubrication system:
Oil filter type Paper type ----
Oil pump type Trochoid type ----
Tip clearance 0.12 mm or less (0.0047 in or less) 0.20 mm (0.008
in)
Side clearance 0.09–0.17 mm (0.0035–0.0067 in) 0.24 mm (0.009
in)
Housing and rotor clearance 0.03–0.10 mm (0.0012–0.0039 in) 0.17 mm
(0.0067 in)
Cooling:
Radiator core size
Width 120.2 mm (4.7 in) ----
Item Standard Limit