Yamaha XG250 Service Manual page 19

Camshaft
Drive system
Camshaft journal diameter
Camshaft lobe dimensions
Intake A
Limit
Intake B
Limit
Exhaust A
Limit
Exhaust B
Limit
Camshaft runout limit
B
B
Timing chain
Model/number of links
Tensioning system
Rocker arm/rocker arm shaft
Rocker arm inside diameter
Limit
Rocker arm shaft outside diameter
Limit
Rocker-arm-to-rocker-arm-shaft clearance
Valve, valve seat, valve guide
Valve clearance (cold)
Intake
Exhaust
Valve dimensions
Valve head diameter A (intake)
Valve head diameter A (exhaust)
Valve face width B (intake)
Valve face width B (exhaust)
A
A
A
B
ENGINE SPECIFICATIONS
Chain drive (right)
24.960–24.980 mm (0.9827–0.9835 in)
36.520–36.620 mm (1.4378–1.4417 in)
36.460 mm (1.4354 in)
30.201–30.301 mm (1.1890–1.1930 in)
30.151 mm (1.1870 in)
36.564–36.664 mm (1.4395–1.4435 in)
36.514 mm (1.4376 in)
30.216–30.316 mm (1.1896–1.1935 in)
30.166 mm (1.1876 in)
0.030 mm (0.0012 in)
DID SCR-0404 SDH/104
Automatic
12.000–12.018 mm (0.4724–0.4731 in)
12.036 mm (0.4739 in)
11.981–11.991 mm (0.4717–0.4721 in)
11.950 mm (0.4705 in)
0.009–0.037 mm (0.0004–0.0015 in)
0.05–0.10 mm (0.0020–0.0039 in)
0.10–0.15 mm (0.0039–0.0059 in)
33.90–34.10 mm (1.3346–1.3425 in)
28.40–28.60 mm (1.1181–1.1260 in)
2.260 mm (0.0890 in)
2.260 mm (0.0890 in)
2-3