Technical data
Oil scraper ring: Quantity ................................................................. 1 Width, including spring ........................................... 4.3 mm (0.011811") Piston ring clearance in groove, ............................. 0.05 -0.10 mm (0.001968 - 0.003937") Piston ring gap, measured at ring opening .............. 0.35 -0.75 mm (0.013779 - 0.029527")
Valve mechanism
Valves Valve head, diameter: Inlet .................................................................... 38 mm (1.49606") Exhaust .............................................................. 38 mm (1.49606") Valve stem, diameter: Inlet .................................................................... 8 mm (0.31496") Exhaust .............................................................. 8 mm (0.31496") Valve seat angle (A): Inlet .................................................................... 29.5째 Exhaust .............................................................. 29.5째 Seat angle in cylinder head (B): Inlet .................................................................... 30째 Exhaust .............................................................. 30째 Dimension between valve head and cylinder head plane: Inlet .................................................................... min 0.95 mm (0.037401") Exhaust .............................................................. min 1.25 mm (0.049212") NOTE! When the valve seats are changed, the valves must be changed at the same time. Valve clearance, cold engine, setting value: Inlet .................................................................... 0.2 mm (0.007874") Exhaust .............................................................. 0.5 mm (0.019685") Valve clearance, cold engine, check value: Inlet .................................................................... 0.15 -0.25 mm (0.005905 - 0.009842") Exhaust .............................................................. 0.45 -0.55 mm (0.017716 - 0.021653")
8
Group 20