Valve, Intake/Exhaust

Valve Operating Mechanism
Type Overhead Valve
Valves Intake
Type Double
Material Silicon Steel
Number Per Cylinder 2
Rotation None
Seat Insert Material Sintered Steel
Seat Angle degrees 45 degrees from Vertical
Head Diameter - in 33 mm (1.30 inch)
Stem Diameter - in 7 mm (0.28 inch)
Lift - In 9.55 mm (0.376 inch)
Clearance - Cold - In 0.3 mm (0.012 inch)
Valves, Exhaust
Type Double
Material Silicon Steel
Number Per Cylinder 2
Rotation None
Seat Angle 45 degrees from Vertical
Seat Insert Material Sintered Steel
Head Diameter- in 31 mm (1.22 inch)
Stern Diameter- in 7 mm (0.28 inch)
Lift - in 9.62 mm (0.379 inch)
Valve System
Valve Face Angle - Production Value 45 degrees
Valve Margin Production Value
Intake 1.2 mm (0.0472 inch)
Exhaust 1.0 mm (0.0394 inch)
Valve Margin - Service Limit
Intake 0.88 mm (0.0346 inch)
Exhaust 0.73 mm (0.0287 inch)
Valve Clearance - Production Value 0.3 mm (0.0118 inch)
Valve Guide Inside Diameter - Intake - Service Limit 7.09 mm (0.2791 inch)
Valve Guide Inside Diameter - Intake - Production Value 7.000-7.015 mm (0.2755-0.2762 inch)
Valve Guide Inside Diameter - Exhaust - Service Limit 7.16 mm (0.2819 inch)
Valve Guide Inside Diameter - Exhaust - Production Value 7.000-7.015 mm (0.2755-0.2762 inch)
Valve Depression - Exhaust - Service Limit 2 mm (0.0787 inch)
Valve Depression - Exhaust - Production Value 0.9 mm (0.0354 inch)
Valve Depression - Intake - Service Limit 2.5 mm (0.0984 inch)
Valve Depression - Intake - Production Valve 0.6 mm (0.0236 inch)
Valve Rocker Arm Ratio - Exhaust 1.69:1
Valve Rocker Arm Ratio - Intake 1.36:1
Valve Seat Angle - Production Value 45 degrees
Valve Contact Width - Exhaust - Service Limit 2.5 mm (0.0984 inch)
Valve Contact Exhaust Production Value 2.1 mm (0.0827 inch)
Valve Contact Width - Intake - Service Limit 2.5 mm (0.0984 inch)
Valve Contact Width Intake Production Value 2.1 mm (0.0827 inch)
Valve Spring Free Length - Production Value 56.6 mm (2.2283 inch)
Valve Spring Squareness - Service Limit 2.0 mm (0.0787 inch)
Valve Spring Installed Height - Exhaust - Production Value 41 mm (1.6142 inch)
Valve Spring Installed Height - Intake - Production Value 41 mm (1.6142 inch)
Valve Spring Tension - Exhaust - Service Limit 275 N at 41 mm (61.8 lb. at 1.61 inch)
Valve Spring Tension - Exhaust - Production Value 315-363 N at 41 mm (71.0-81.6 lb. at 1.61 inch)
Valve Spring Tension - Intake - Service Limit 306 N at 41 mm (68.8 lb. at 1.61 inch)
Valve Spring Tension - Intake - Production Value 315-363 N at 41 mm (71.0-81.6 lb. at 1.61 inch)
Valve Stem Outside Diameter - Intake - Service Limit 6.89 mm (0.2713 inch)
Valve Stem Outside Diameter - Intake - Production Value 6.952-6.970 mm (0.2737-0.2744 inch)
Valve Stem Outside Diameter - Exhaust - Service Limit 6.91 mm (0.2720 inch)
Valve Stem Outside Diameter - Exhaust - Production Value 6.942-6.962 mm (0.2734-0.2741 inch)
Valve Stem Clearance - Exhaust - Service Limit 0.20 mm (0.0079 inch)
Valve Stem Clearance - Exhaust - Production Value 0.038-0.071 mm (0.0015-0.0028 inch)
Valve Stem Clearance - Intake - Service Limit 0.20 mm (0.0079 inch)
Valve Stem Clearance - Intake - Production Value 0.030-0.063 mm (0.0012-0.0025 inch)
Valve Stem Seal Installed Height - Measured from the Top of the Cylinder Head to the Bottom of the Valve Stem Seal - Production Value 6.05 mm (0.2382 inch)