Yamaha WR250F(N), Owner'S Service Manual

Page: 77 / 686

SPEC
2 - 4
MAINTENANCE SPECIFICATIONS
MAINTENANCE SPECIFICATIONS
ENGINE
Item Standard Limit
Cylinder head:
Warp limit ---- 0.05 mm
(0.002 in)
Cylinder:
Bore size 77.00 ~ 77.01 mm
(3.0315 ~ 3.0319 in) ----
Out of round limit ---- 0.05 mm
(0.002 in)
Camshaft:
Drive method Chain drive (Left) ----
Camshaft cap inside diameter 22.000 ~ 22.021 mm
(0.8661 ~ 0.8670 in) ----
Camshaft outside diameter 21.967 ~ 21.980 mm
(0.8648 ~ 0.8654 in) ----
Shaft-to-cap clearance 0.020 ~ 0.054 mm
(0.0008 ~ 0.0021 in) 0.08 mm
(0.003 in)
Cam dimensions
Intake “A” 30.296 ~ 30.346 mm
(1.1923 ~ 1.1947 in) 30.196 mm
(1.1888 in)
“B” 22.45 ~ 22.55 mm
(0.8839 ~ 0.8878 in) 22.35 mm
(0.8799 in)
Exhaust “A” 30.399 ~ 30.499 mm
(1.1968 ~ 1.2007 in) 30.299 mm
(1.1929 in)
“B” 22.45 ~ 22.55 mm
(0.8839 ~ 0.8878 in) 22.35 mm
(0.8799 in)
Camshaft runout limit ---- 0.03 mm
(0.0012 in)
A
B