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ENGINE TOP END 5-7
Specifications
Item Standard Service Limit
Valve spring free length:
Exhaust 40.7 mm (1.602 in.) 38.9 mm (1.531 in.)
Inlet 40.7 mm (1.602 in.) 38.9 mm (1.531 in.)
Cylinder, Pistons:
Cylinder inside diameter: 68.400 ∼ 68.412 mm (2.6929 ∼ 2.6934 in.) 68.50 mm (2.6969 in.)
Piston diameter 68.345 ∼ 68.360 mm (2.6907 ∼ 2.6913 in.) 68.21 mm (2.6854 in.)
Piston/cylinder clearance 0.040 ∼ 0.067 mm (0.0016 ∼ 0.0026 in.) –––
Piston ring/groove
clearance:
Top 0.04 ∼ 0.08 mm (0.0016 ∼ 0.0031 in.) 0.18 mm (0.0071 in.)
Second 0.02 ∼ 0.06 mm (0.0008 ∼ 0.0024 in.) 0.16 mm (0.0063 in.)
Piston ring groove w idth:
Top 0.83 ∼ 0.85 mm (0.0327 ∼ 0.0335 in.) 0.93 mm (0.037 in.)
Second 0.81 ∼ 0.83 mm (0.0319 ∼ 0.0327 in.) 0.91 mm (0.036 in.)
Piston ring thickness:
Top 0.77 ∼ 0.79 mm (0.0303 ∼ 0.0311 in.) 0.70 mm (0.028 in.)
Second 0.77 ∼ 0.79 mm (0.0303 ∼ 0.0311 in.) 0.70 mm (0.028 in.)
Piston ring end gap:
Top 0.30 ∼ 0.40 mm (0.0118 ∼ 0.0157 in.) 0.7 mm (0.028 in.)
Second 0.45 ∼ 0.55 mm (0.0177 ∼ 0.0217 in.) 0.8 mm (0.031 in.)