Dimension & Clearance Specifications - Valves

Valve Guide Inside Diameter 7.000-7.015mm (0.2756-0.2761 inch)
Valve Head Thickness:
Intake Valves (Standard) 1.0 mm (0.039 inch)
Intake Valves (Minimum Limit) 0.6 mm (0.023 inch)
Exhaust Valves (Standard) 1.0 mm (0.039 inch)
Exhaust Valves (Minimum Limit) 0.7 mm (0.027 inch)
Valve Seating Contact Width:
Intake and Exhaust 1.30-1.50 mm (0.0512-0.0590 inch)
Valve Stem Outside Diameter:
Intake Valves 6.965-6.980 mm (0.2742-0.2748 inch)
Exhaust Valves 6.950-6.965 mm (0.2737-0.2742 inch)
Valve Stem Radial Runout (Minimum):
Intake and Exhaust 0.08 mm (0.003 inch)
Valve Stem-to-Valve Guide Clearance:
Intake Valves (Standard) 0.020-0.050 mm (0.0008-0.0019 inch)
Intake Valves (Maximum Limit) 0.070 mm (0.0027 inch)
Exhaust Valves (Standard) 0.035-0.065 mm (0.0014-0.0025 inch)
Exhaust Valves (Maximum Limit) 0.090 mm (0.0035 inch)
Valve Spring Free Length:
Standard 49.30 mm (1.9409 inch)
Limit (Minimum) 48.10 mm (1.8937 inch)
Valve Spring Preload:
Standard 24.8-29.2 kg at 41.5 mm (54.7-64.3 lb. at 1.63 inch)
Limit (Minimum) 22.8 kg at 41.5 mm (50.2 lb. at 1.63 inch)
Valve Spring Squareness Deviation (Maximum) 2.0 mm (0.079 inch)