Valve Seat

Refacing Dimension [1]
Minimum dimensions
Intake valve 36.0 mm
Exhaust valve 36.3 mm

Intake Valve Seat
Seat Diameter Outer Edge 31.2 mm (1.229 in)
Seat Angle 45°
Seat Width 1.5 mm to 1.8 mm (0.059 in to 0.071 in)
Lower Correcting Angle 75°
Upper Correcting Angle 30°

Exhaust Valve Seat
Seat Diameter Outer Edge 27.6 mm (1.087 in)
Seat Angle 45°
Seat Width Approximately 1.8 mm (0.071 in)
Upper Correcting Angle 30°


[1] Measure distance between center of valve stem end and upper edge of cylinder head.