Cylinder Head Assembly: Specifications

CYLINDER HEAD AND VALVES

Valve Seat
Angle 44.50 - 45.00°
Runout (Max.) 0.05 mm (0.0019 in.)
Width (Finish)
Intake 1.018 - 1.62 mm (0.0464 - 0.0637 in.)
Exhaust 1.48 - 1.92 mm (0.0582 - 0.0755 in.)
Valves
Face Angle 45.0 - 45.5°
Head Diameter
Intake 50.67 mm - 50.93 mm (1.99 in.) - (2.00 in.)
Exhaust 39.27 mm - 39.53 mm (1.54 in.) - (1.55 in.)
Length (Overall)
Intake 123.38 - 123.76 mm (4.857 inch - 4.872 in.)
Exhaust 120.475 - 120.855 mm (4.743 inch - 4.758 in.)
Valve Lift (@ zero lash)
Intake 12 mm (0.472 in.)
Exhaust 11.7 mm (0.460 in.)
Stem Diameter
Intake 7.935 - 7.953 mm (0.312 - 0.313 in.)
Exhaust 7.905 - 7.925 mm (0.311 - 0.312 in.)
Guide Bore 7.975 - 8.000 mm (0.313 - 0.314 in.)
Stem to Guide Clearance
Intake 0.022 - 0.065 mm (0.0008 - 0.0025 in.)
Exhaust 0.050 - 0.095 mm (0.0019 - 0.0037 in.)
Valve Springs
Spring Tension
Valve closed 422 N @ 46.0 mm (95 lbs. @ 1.81 in.)
Valve open @ 33.5 mm
Number of Coils 7.4
Installed Height 46.0 mm (1.81 in.)
Wire Diameter 5.39 x 4.52 mm (0.212 - 0.177 in.)





Cylinder Head Bolts
M-12 Bolts
Step 1 34 Nm (25 ft. lbs.)
Step 2 54 Nm (40 ft. lbs.)
Step 3 Turn 90°
M-8 Bolts
Step 1 20 Nm (15 ft. lbs.)
Step 2 34 Nm (25 ft. lbs.)
Cylinder Head Cover Bolts 8 Nm (70 in. lbs.)