Valve, Intake/Exhaust

MECHANICAL SPECIFICATIONS

Cylinder Head Dimensions
Height 124.45 - 124.55 mm (4.8995 - 4.9035 inch)
Distortion 0.10 mm (0.004 inch) max.
Grinding 0.15 mm (0.006 inch) max.

Cylinder Head Bolt Length
Standard 104.2 - 104.8 mm (4.103 - 4.125 inch)
Maximum 105.5 mm (4.154 inch)

VALVES
Margin Thickness
IN 0.07 - 1.50 mm (0.028 - 0.059 inch)
EX 0.55 - 1.55 mm (0.022 - 0.061 inch)
Valve Length
IN:
Standard 89.49 - 90.09 mm (3.524 - 3.546 inch)
Minimum 89.28 mm (3.515 inch)
EX:
Standard 89.79 - 90.39 mm (3.536 - 3.558 inch)
Minimum 89.38 mm (3.519 inch)
Valve Stem Diameter
IN:
Standard 5.970 - 5.985 mm (0.2351 - 0.2356 inch)
Minimum 5.920 mm (0.2329 inch)

valve Guides
Guide Inner Diameter
IN 6.01 - 6.03 mm (0.2367 - 0.2374 inch)
EX 6.01 - 6.03 mm (0.2367 - 0.2374 inch)
Valve Guide Protrusion Height
IN 13.5 - 14.1 mm (0.532 - 0.555 inch)
EX 13.5 - 14.1 mm (0.532 - 0.555 inch)

Valve Seat
Seat Contact Width
IN 0.9 - 1.3 mm (0.036 - 0.051 inch)
EX 0.9 - 1.3 mm (0.036 - 0.051 inch)
Seat Angle
IN 45 °
EX 45 °
Seat Sinking (Valve Protrusion Height)
IN:
Standard 39.0 mm (1.535 inch)
Minimum 39.6 mm (1.559 inch)
EX:
Standard 39.0 mm (1.535 inch)
Minimum 39.6 mm (1.559 inch)

Valve Spring
Pressing Force At Valve Spring Height H: 36.5 mm (1.44 inch)
IN 177.1 - 200.1 mm (18.05 - 20.40, 39.71 - 44.88 inch)
EX 177.1 - 200.1 mm (18.05 - 20.40, 39.71 - 44.88 inch)
Out Of Square
IN 1.54 mm (0.61 inch) max.
EX 1.54 mm (0.61 inch) max.

Valve Clearance
Not Adjustable, Maintenance-free