Yamaha XT250X - Page 22

ENGINE SPECIFICATIONS
2-3
Camshaft lobe dimensions
Intake A 36.520–36.620 mm (1.4378–1.4417 in)
Limit 36.460 mm (1.4354 in)
Intake B 30.201–30.301 mm (1.1890–1.1930 in)
Limit 30.151 mm (1.1870 in)
Exhaust A 36.564–36.664 mm (1.4395–1.4435 in)
Limit 36.514 mm (1.4376 in)
Exhaust B 30.216–30.316 mm (1.1896–1.1935 in)
Limit 30.166 mm (1.1876 in)
Camshaft runout limit 0.030 mm (0.0012 in)
Timing chain
Model/number of links DID SCR-0404 SV/104
Tensioning system Automatic
Rocker arm/rocker arm shaft
Rocker arm inside diameter 12.000–12.018 mm (0.4724–0.4731 in)
Limit 12.036 mm (0.4739 in)
Rocker arm shaft outside diameter 11.981–11.991 mm (0.4717–0.4721 in)
Limit 11.950 mm (0.4705 in)
Rocker-arm-to-rocker-arm-shaft clearance 0.009–0.037 mm (0.0004–0.0015 in)
Valve, valve seat, valve guide
Valve clearance (cold)
Intake 0.05–0.10 mm (0.0020–0.0039 in)
Exhaust 0.10–0.15 mm (0.0039–0.0059 in)
Valve dimensions
Valve head diameter A (intake) 33.90–34.10 mm (1.3346–1.3425 in)
Valve head diameter A (exhaust) 28.40–28.60 mm (1.1181–1.1260 in)
Valve face width B (intake) 2.260 mm (0.0890 in)
Valve face width B (exhaust) 2.260 mm (0.0890 in)
Valve seat width C (intake) 0.90–1.10 mm (0.0354–0.0433 in)
Valve seat width C (exhaust) 0.90–1.10 mm (0.0354–0.0433 in)
A
B
A
B