Yamaha MBK XMAX 2014, Service Manual

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ENGINE SPECIFICATIONS
2-4
Timing chain
Tensioning system Automatic
Rocker arm/rocker arm shaft
Rocker arm inside diameter 9.985–10.000 mm (0.3931–0.3937 in)
Limit 10.015 mm (0.3943 in)
Rocker arm shaft outside diameter 9.966–9.976 mm (0.3924–0.3928 in)
Limit 9.940 mm (0.3913 in)
Rocker-arm-to-rocker-arm-shaft clearance 0.009–0.034 mm (0.0004–0.0013 in)
Limit 0.075 mm (0.0030 in)
Valve, valve seat, valve guide
Valve clearance (cold)
Intake 0.10–0.14 mm (0.0039–0.0055 in)
Exhaust 0.22–0.26 mm (0.0087–0.0102 in)
Valve dimensions
Valve head diameter (intake) 19.40–19.60 mm (0.7638–0.7717 in)
Valve head diameter (exhaust) 16.90–17.10 mm (0.6654–0.6732 in)
Valve seat contact width (intake) 0.90–1.10 mm (0.0354–0.0433 in)
Limit 1.6 mm (0.06 in)
Valve seat contact width (exhaust) 0.90–1.10 mm (0.0354–0.0433 in)
Limit 1.6 mm (0.06 in)
Valve stem diameter (intake) 4.475–4.490 mm (0.1762–0.1768 in)
Limit 4.445 mm (0.1750 in)
Valve stem diameter (exhaust) 4.460–4.475 mm (0.1756–0.1762 in)
Limit 4.430 mm (0.1744 in)
Valve guide inside diameter (intake) 4.500–4.512 mm (0.1772–0.1776 in)
Limit 4.550 mm (0.1791 in)
Valve guide inside diameter (exhaust) 4.500–4.512 mm (0.1772–0.1776 in)
Limit 4.550 mm (0.1791 in)
Valve-stem-to-valve-guide clearance (intake) 0.010–0.037 mm (0.0004–0.0015 in)
Limit 0.080 mm (0.0032 in)
Valve-stem-to-valve-guide clearance (exhaust) 0.025–0.052 mm (0.0010–0.0020 in)
Limit 0.100 mm (0.0039 in)
Valve stem runout 0.010 mm (0.0004 in)
Valve spring
Free length (intake) 41.71 mm (1.64 in)
Limit 39.62 mm (1.56 in)
Free length (exhaust) 41.71 mm (1.64 in)
Limit 39.62 mm (1.56 in)
Installed length (intake) 35.30 mm (1.39 in)
Installed length (exhaust) 35.30 mm (1.39 in)
Spring rate K1 (intake) 23.54 N/mm (2.40 kgf/mm, 134.41 lbf/in)
Spring rate K2 (intake) 36.58 N/mm (3.73 kgf/mm, 208.87 lbf/in)