Rebuild Specifications

Cylinder Head
Combustion Chamber 55.22 - 58.22 cc (3.37 - 3.55 Cu. in.)
Valve Guide I.D. (Integral) 7.9 mm (0.312 in)
Valve Stem-to-Guide Clearance 0.025 - 0.076 mm (0.001 - 0.003 in)
Intake Valve Seat Angle 44.5°
Exhaust Valve Seat Angle 44.5°
Valve Seat Width 1.02 - 1.52 mm (0.040 - 0.060 in)
Valve Seat Runout 0.064 mm (0.0025 in)
Flatness,
0.03 mm per 25 mm (0.001 in per 1 in)
0.05 mm per 152 mm (0.002 in per 6 in)
Maximum For Total Length 0.20 mm (0.008 in.)