Yamaha SR250G Service Manual page 85

Required <Allowance>
Camshaft rurou Amit
Valve timing:
lintske open
Intake clos
Duration
Exnaust open
Exraust close
Exnaust duration
V a l v e over lap
0.1 mm (9.0639 nie
BTDC 28"
ABDC 68°
278
Becces
ATDC 32
278
Rocker arm and rocker shaft
Hocker arm bearing dia. (1.0)
Rocker arm shatt dia. (0.0.1
Clarence
Valve, valve seat and valve cuide
Velvwelea ance (cold IN
x
No. of valves par eylinder
Dimensions
732 in 40.1744 ino)
mn ¢1 1.96 mm
(0.4714 ~ 0.4720 in 40.4708 n>)
0.01 ~ 0.04 mm 49.11 mmo.
16 in <0.0083 in)
5 -~ 07mm 6.0070-~ 0.9639 i*)
0.17 ~ 0°77 mm 0.0047 ~ 0.9087 int
2 pes.