ENGINE SPECIFICATIONS
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)
Cylinder head valve seat width (intake) 0.90–1.10 mm (0.0354–0.0433 in)
Limit 1.6 mm (0.06 in)
Cylinder head valve seat width (exhaust) 0.90–1.10 mm (0.0354–0.0433 in)
Limit 1.6 mm (0.06 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 lb/in)
Spring rate K2 (intake) 36.58 N/mm (3.73 kgf/mm, 208.87 lb/in)
Spring rate K1 (exhaust) 23.54 N/mm (2.40 kgf/mm, 134.41 lb/in)
Spring rate K2 (exhaust) 36.58 N/mm (3.73 kgf/mm, 208.87 lb/in)
Installed compression spring force (intake) 140.00–162.00 N (14.28–16.52 kgf, 31.47–
36.42 lbf)
Installed compression spring force (exhaust) 140.00–162.00 N (14.28–16.52 kgf, 31.47–
36.42 lbf)
Spring tilt (intake) 2.5°/1.8 mm
Spring tilt (exhaust) 2.5°/1.8 mm
Winding direction (intake) Clockwise
Winding direction (exhaust) Clockwise
Cylinder
Bore 52.000–52.010 mm (2.0472–2.0476 in)
Wear limit 52.110 mm (2.0516 in)
Taper limit 0.050 mm (0.0020 in)
Out of round limit 0.005 mm (0.0002 in)
Piston
Piston-to-cylinder clearance 0.015–0.048 mm (0.0006–0.0019 in)
Limit 0.15 mm (0.0059 in)
Diameter D 51.962–51.985 mm (2.0457–2.0466 in)
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