Cylinder Head Assembly: Specifications
Cylinder Head and Valve TrainCylinder head gasket surface flatness 0.05 mm (0.002 inch) in any 150 mm x 150 mm (6.0 inch x 6.0 inch) area
Combustion chamber volume 52 ± 0.5 cc
Valve arrangement (front to rear)-LH E-I-E-I-E-I-E-I
Valve arrangement (front to rear)-RH I-E-I-E-I-E-I-E
Valve guide bore diameter 7.044 - 7.015 mm (0.2773 - 0.2761 inch)
Valve stem diameter- intake 6.995 - 6.965 mm (0.275 - 0.2742 inch)
Valve stem diameter- exhaust 6.970 - 6.940 mm (0.274 - 0.2732 inch)
Valve stem - to - guide clearance 0.020 - 0.079 mm (0.0008 - 0.0031 inch)
Valve head diameter - intake 44.5 mm (1.75 inch)
Valve head diameter - exhaust 36.0 mm (1.41 inch)
Valve face runout 0.05 mm (0.002 inch)
Valve face angle 45.25 - 45.75 degrees
Valve seat width 1.9 - 2.1 mm (0.0748 - 0.0827 inch)
Valve seat runout (T.I.R.) maximum 0.025 mm (0.001 inch)
Valve seat angle 44.51 - 45.01 degrees
Valve spring free length 53.37 mm (2.10 inch) ± 1.0 mm (0.039 inch)
Valve spring squareness 2 degrees
Valve spring compression pressure 720.0 - 800.0 N @ 28.80 mm
Valve spring installed height 39.7 - 40.3 mm (1.5630 - 1.5866 inch)
Valve spring installed pressure 283.0 - 321.0 N @ 42.56 mm
Rocker arm ratio 1.80:1
LH:
RH:
CAUTION: Cylinder head bolts must be discarded and new bolts installed. They are tighten-to-yield designed and cannot be reused.
Cylinder Head bolts
Stage 1 40 Nm (30 ft. lbs.)
Stage 2 additional 90 degrees
Stage 3 Back out all bolts one full turn (360 degrees)
Stage 4 40 Nm (30 ft. lbs.)
Stage 5 additional 90 degrees
Stage 6 additional 90 degrees
Camshaft Bearing Caps
LH:
RH:
Exhaust Manifold nuts
Camshaft Pulley/Gear Torque
For tightening specifications refer to Service and Repair procedure. Service and Repair