Inspecting the cylinder
- Using a bore meter, measure the inner cylinder
diameter at three different points according to the
directions shown in the figure.
- Check that the head coupling surface is not worn
or misshapen.
- Pistons and cylinders are classified according to
diameter. The coupling must be made with those
of the same type (M-M, N-N, O-O, P-P).
Characteristic
cylinder: standard diameter
71.990 - 72.018 mm (at 33 mm)
Maximum allowable run-out:
0.05 mm
Inspecting the piston rings
Sealing rings
- Alternately insert the three sealing rings into the
cylinder, in the area where it retains its original di-
ameter. Using the piston, insert the rings perpen-
dicularly to the cylinder axis.
- Measure the opening (see figure) of the sealing
rings using a feeler gauge.
- If any measurements are greater than specified,
replace the piston rings.
N.B.
BEFORE REPLACING ONLY THE PISTON
RINGS, ENSURE THAT THE CLEARANCE BE-
TWEEN THE PISTON RINGS AND THE PISTON
RING GROOVES, AND BETWEEN THE PISTON
AND THE CYLINDER, IS AS SPECIFIED. IN ANY
CASE, NEW PISTON RINGS USED IN COMBI-
NATION WITH A USED CYLINDER MAY HAVE
DIFFERENT BEDDING CONDITIONS THAN
THE STANDARD.
Characteristic
Top piston ring
Standard opening: 0.15 ÷ 0.30 mm
Middle piston ring
Standard opening: 0.20 ÷ 0.40 mm
Vespa GTS 250 I.E.
Engine
ENG - 35
Summary of Contents for GTS 250 I.E.
Page 1: ...WORKSHOP MANUAL 633577 Vespa GTS 250 I E ...
Page 4: ......
Page 6: ......
Page 7: ...INDEX OF TOPICS CHARACTERISTICS CHAR ...
Page 19: ...INDEX OF TOPICS TOOLING TOOL ...
Page 32: ...Tooling Vespa GTS 250 I E TOOL 14 ...
Page 33: ...INDEX OF TOPICS MAINTENANCE MAIN ...
Page 47: ...INDEX OF TOPICS TROUBLESHOOTING TROUBL ...
Page 51: ...INDEX OF TOPICS ELECTRICAL SYSTEM ELE SYS ...
Page 56: ...Front side 1 Saddle opening switch 2 Wirings Electrical system Vespa GTS 250 I E ELE SYS 6 ...
Page 90: ... Refit the battery cover Connectors Electrical system Vespa GTS 250 I E ELE SYS 40 ...
Page 91: ...INDEX OF TOPICS ENGINE FROM VEHICLE ENG VE ...
Page 98: ...Engine from vehicle Vespa GTS 250 I E ENG VE 8 ...
Page 99: ...INDEX OF TOPICS ENGINE ENG ...
Page 156: ...Engine Vespa GTS 250 I E ENG 58 ...
Page 164: ...Engine Vespa GTS 250 I E ENG 66 ...
Page 165: ...INDEX OF TOPICS INJECTION INJEC ...
Page 168: ...Injection Vespa GTS 250 I E INJEC 4 ...
Page 184: ... REMOTE CONTROLS CONTROL UNIT FUSES ETC Injection Vespa GTS 250 I E INJEC 20 ...
Page 198: ...Components location Injection Vespa GTS 250 I E INJEC 34 ...
Page 204: ...Injection Vespa GTS 250 I E INJEC 40 ...
Page 218: ...Injection Vespa GTS 250 I E INJEC 54 ...
Page 219: ...INDEX OF TOPICS SUSPENSIONS SUSP ...
Page 240: ...Suspensions Vespa GTS 250 I E SUSP 22 ...
Page 241: ...INDEX OF TOPICS BRAKING SYSTEM BRAK SYS ...
Page 257: ...INDEX OF TOPICS COOLING SYSTEM COOL SYS ...
Page 260: ...Cooling system Vespa GTS 250 I E COOL SYS 4 ...
Page 261: ...INDEX OF TOPICS CHASSIS CHAS ...
Page 273: ...INDEX OF TOPICS PRE DELIVERY PRE DE ...
Page 277: ...INDEX OF TOPICS TIME TIME ...