System Specifications
Cylinder Head and Valve TrainCombustion chamber volume 53.5 - 50.5 cc (3.2648 - 3.0817 cubic inch)
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 - 0.2762 inch)
Valve stem diameter - intake 6.995 - 6.975 mm (0.2754 - 0.2746 inch)
Valve stem diameter - exhaust 6.970 - 6.949 mm (0.2744 - 0.2736 inch)
Valve stem-to-guide clearance - intake 0.069 - 0.020 mm (0.0027 - 0.0008 inch)
Valve stem-to-guide clearance - exhaust 0.095 - 0.045 mm (0.0037 - 0.0018 inch)
Valve head diameter - intake 44.63 - 44.37 mm (1.7571 - 1.7469 inch)
Valve head diameter - exhaust 36.01 mm (1.4177 inch)
Valve face runout 0.05 mm (0.0020 inch)
Valve face angle 45.75 - 45.25 degrees
Valve seat width 2.1 - 1.9 mm (0.0827 - 0.0748 inch)
Valve seat runout (T.I.R.) 0.025 mm (0.0010 inch)
Valve seat angle 45.50 degrees
Valve spring free length 50.2 mm (1.9764 inch)
Valve spring squareness 2.5 degrees
Valve spring compression pressure 667.3 N @ 28.02 mm (150.015 lb @ 1.1032 inch)
Valve spring installed height 42.9 - 42.3 mm (1.6890 - 1.6654 inch)
Valve spring installed pressure - valve open 760 N @ 28.80 mm (170.855 lb @ 1.1339 inch)
Valve spring installed pressure - valve closed 302 N @ 42.56 mm (67.8923 lb @ 1.6756 inch)
Roller follower ratio 1.75:1
For torque specifications, refer to the service procedure.