Removing The Piston; Choosing The Gasket - VESPA GTS 250 I.E. Workshop Manual

Engine
scraper ring
Standard opening: 0.20 ÷ 0.40 mm

Removing the piston

- Install piston and wrist pin onto the connecting
rod, aligning the piston arrow the arrow facing to-
wards the exhaust.
- Fit the wrist pin stop ring onto the appropriate tool
- With opening in the position indicated on the tool
S = left
D= right
- Place the wrist pin stop ring into position using a
punch
- Fit the wrist pin stop using the plug as shown in
the figure
N.B.
THE TOOL FOR INSTALLING THE STOP
RINGS MUST BE USED MANUALLY.
CAUTION
USING A HAMMER MIGHT DAMAGE THE
STOPS' HOUSING.
Specific tooling
020454Y Tool for fitting piston pin stops (200 -
250)

Choosing the gasket

Characteristic
Compression ratio 250 version
CR: 10.5 ÷ 11.5 : 1
ENG - 36
Vespa GTS 250 I.E.