Gilera Runner RST 50 SP, Service Station Manual, Page: 13 / 183

Cylinder - piston assy.
CYLINDER-PISTON FITTING
Name Initials Cylinder Piston Play on fitting
Standard fitting M 39.997-40.004 39.943-39.95 0.047-0.061
Standard fitting N 40.004-40.011 39.95-39.957 0.047-0.061
Standard fitting O 40.011-40.018 39.957-39.964 0.047-0.061
Standard fitting P 40.018-40.025 39.964-39.971 0.047-0.061
1st oversize fitting M1 40.197-40.204 40.143-40.15 0.047-0.061
1st oversize fitting N1 40.204-40.211 40.15-40.157 0.047-0.061
1st oversize fitting O1 40.211-40.218 40.157-40.164 0.047-0.061
1st oversize fitting P1 40.218-40.225 40.164-40.171 0.047-0.061
2nd oversize fitting M2 40.397-40.404 40.343-40.35 0.047-0.061
2nd oversize fitting N2 40.404-40.411 40.35-40.357 0.047-0.061
2nd oversize fitting O2 40.411-40.418 40.357-40.364 0.047-0.061
2nd oversize fitting P2 40.418-40.425 40.364-40.371 0.047-0.061
Piston rings
SEALING RINGS
Name Description Dimensions Initials Quantity
Compression ring 40 A 0.10 to 0.25
Compression ring 1st
oversize
40.2 A 0.10 to 0.25
Compression ring 2nd
Oversize
40.4 A 0.10 to 0.25
Runner RST 50 SP
Characteristics
CHAR - 13