Cylinders and Pistons

Min. gap between cyl. and piston Max. gap between cyl. and piston Limit of utilization 650 Twin and 1000 Triple

Standard piston 74.910 - 74.920mm S50 74.920 - 74.930mm (1000).

for cylinder bore 75.00 - 75.018mm

750 Twin and 1200 Triple

Standard piston 79.910 - 79.920mm (7501 79.920 - 79.930mm (1200), for cylinder bore 80.00 - 80.018mm -0.4mm - 80.310 - 80.320mm, for 80.40 - 80.418mm -0.6mm - 80.810 - 80.520mm, for 80.60 - 80.618mm NOTE: Pistons are not interchangeable from Twin to Triple even though they may be of similar size

Gudgeon pins Small end ID Piston hole diameter Gudgeon pin diameter Normal clearance Maximum clearance Piston rings

1st and 2nd rings standard end gap in bore 3rd ring (oil ring) gap

20.015 - 20.025mm

not more than 0.05mm (all models)

0.20 - 0.30mm, maximum gap 0.40mm 0.15 - 0.20mm, maximum 0.50mm

1st ring gap in groove 2nd ring gap in groove 3rd ring gap in groove

0.06 - 0.07mm, maximum 0.10mm 0.05 - 0.06mm, maximum 0.10mm 0.03 - 0.04mm, maximum 0.10mm

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