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Removing The Piston - Derbi Rambla 250 Manual

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Engine
THE PISTON AND THE CYLINDER ARE AS SPECIFIED. IN
ANY CASE, NEW PISTON SEALING RINGS USED IN COM-
BINATION WITH A USED CYLINDER MAY HAVE DIFFER-
ENT BEDDING CONDITIONS THAN THE STANDARD
ONES.
Characteristic
1st compression ring
Standard opening: 0.15 ÷ 0.30 mm
2nd compression ring
Standard opening: 0.20 ÷ 0.40 mm
oil scraper
Standard opening: 0.20 ÷ 0.40 mm

Removing the piston

- Install piston and pin onto the connecting rod,
with the piston arrow aligned facing the exhaust.
- Fit the pin snap ring onto the appropriate tool
- With the opening in the position indicated on the
tool
S = left
D = right
- Set the snap ring into its position with the punch.
- Fit the pin stop ring using the plug as shown in
the figure.
piston fitting
- Install piston and pin onto the connecting rod,
with the piston arrow aligned facing the exhaust.
- Fit the pin snap ring onto the appropriate tool
- With the opening in the position indicated on the
tool
S = left
D = right
- Set the snap ring into its position with the punch.
- Fit the pin stop ring using the plug as shown in
the figure.
NOTE
THE TOOL FOR INSTALLING THE STOP RINGS MUST BE
USED MANUALLY.
CAUTION
USING A HAMMER MAY DAMAGE THE RINGS HOUSINGS.
Specific tooling
ENG - 113

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