Yamaha WR250F(W), Owner'S Service Manual

Page: 101 / 912

MAINTENANCE SPECIFICATIONS
2 - 8
SPEC
Clutch:
Friction plate thickness 2.9 ~ 3.1 mm (0.114 ~ 0.122 in) 2.7 mm
(0.106 in)
Quantity 9 ----
Clutch plate thickness 1.1 ~ 1.3 mm (0.043 ~ 0.051 in) ----
Quantity 8 ----
Warp limit ---- 0.1 mm
(0.004 in)
Clutch spring free length 37.0 mm (1.46 in) 36.0 mm
(1.42 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 5UME E0
Main jet (M.J) #170
Main air jet (M.A.J) #115
Jet needle (J.N) NJRU
Cutaway (C.A) 1.5
Pilot jet (P.J) #42
Pilot air jet (P.A.J) #70
Pilot outlet (P.O) ø0.9
Bypass (B.P) ø1.0
Valve seat size (V.S) ø3.8
Starter jet (G.S) #68
Leak jet (Acc.P) #70
Float height (F.H) 8 mm (0.31 in)
Engine idle speed 1,750 ~ 1,950 r/min
Intake vacuum 31.3 ~ 36.7 kPa
(235 ~ 275 mmHg,
9.25 ~ 10.83 inHg)
Hot starter lever free play 3 ~ 6 mm
(0.12 ~ 0.24 in)
Item Standard Limit