Yamaha WR250F(Y) 2009, Owner'S Service Manual

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2-6
MAINTENANCE SPECIFICATIONS
Compressed force (installed) (IN) 103–118 N at 29.13 mm (10.50–12.09 kg
at 29.13 mm, 23.15–26.66 lb at 1.15 in) ----
Compressed force (installed) (EX) 126–144 N at 29.30 mm (12.85–14.68 kg
at 29.30 mm, 28.32–32.37 lb at 1.15 in) ----
Tilt limit* (IN) ---- 2.5°/1.6 mm
(2.5°/0.063 in)
Tilt limit* (EX) ---- 2.5°/1.6 mm
(2.5°/0.063 in)
Direction of winding (top view) (IN) Clockwise ----
Direction of winding (top view) (EX) Clockwise ----
Piston:
Piston to cylinder clearance 0.030–0.055 mm (0.0012–0.0022 in) 0.1 mm (0.004
in)
Piston size "D" 76.955–76.970 mm (3.0297–3.0303 in) ----
Measuring point "H" 8 mm (0.31 in) ----
Piston off-set 0.5 mm (0.020 in)/IN-side ----
Piston pin bore inside diameter 16.002–16.013 mm (0.6300–0.6304 in) 16.043 mm
(0.6316 in)
Piston pin outside diameter 15.991–16.000 mm (0.6296–0.6299 in) 15.971 mm
(0.6288 in)
Piston rings:
Top ring:
Type Barrel ----
Dimensions (B × T) 0.90 × 2.75 mm (0.04 × 0.11 in) ----
End gap (installed) 0.15–0.25 mm (0.006–0.010 in) 0.50 mm (0.020
in)
Side clearance (installed) 0.030–0.065 mm (0.0012–0.0026 in) 0.12 mm (0.005
in)
Item Standard Limit