General Specifications

General Specifications

Cylinder Head
Combustion chamber volume 42.45-45.45 cc (2.59-2.77 cu inch)
Valve arrangement (front to rear) - LH I-E-1-I-E-1-I-E-1-I-E-I
Valve arrangement (front to rear) - RH I-E-1-I-E-1-I-E-1-I-E-I
Valve guide bore diameter 6.015-6.044 mm (0.237-0.238 inch)
Valve stem diameter - intake 5.975-5.995 mm (0.235-0.236 inch)
Valve stem diameter - exhaust 5.95-5.97 mm (0.234-0.235 inch)
Valve stem-to-guide clearance - intake 0.020-0.045 mm (0.001-0.002 inch)
Valve stem-to-guide clearance - exhaust 0.069-0.094 mm (0.003-0.004 inch)
Valve head diameter - intake 33.62-33.98 mm (1.324-1.338 inch)
Valve head diameter - exhaust 37.32-37.68 mm (1.469-1.483 inch)
Valve face runout 0.05 mm (0.002 inch)
Valve face angle 45.5°
Valve seat width - intake 1.2-1.4 mm (0.047-0.055 inch)
Valve seat width - exhaust 1.4-1.6 mm (0.055-0.063 inch)
Valve seat runout -
Valve seat angle 44.5-45.00
Valve spring free length 55.7 mm (2.19 inch)
Valve spring compression pressure at specified height 350 N (79 lbs.) ± 17.5 N (4 lbs.) @ 42.04 mm (1.66 inch)
Valve spring compression pressure at specified height 760 N (171 lbs.) ± 39 N (9 lbs.) @ 31.04 mm (1.22 inch)
Valve spring installed height 42.04 mm (1.66 inch)
Valve spring installed pressure 350 N (79 lbs.) ± 17.5 N (4 lbs.) @ 42.04 mm (1.66 inch)