Inspecting The Small End - Derbi Rambla 250 Manual

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Engine
Removing the cylinder - piston assy.
Cylinder and piston removal
- Remove the chain guide pad.
- Remove the 4 sealing O-rings on the stud bolts
- Slide off the cylinder.
- Remove the gasket on the cylinder base.
- Remove the 2 seeger rings, the pin and the pis-
ton.
- Remove the piston sealing rings.
CAUTION
TO AVOID DAMAGING THE PISTON, KEEP IT FIRM WHILE
REMOVING THE CYLINDER.
NOTE
BE CAREFUL NOT TO DAMAGE THE SEALING RINGS
DURING REMOVAL.

Inspecting the small end

- Measure the inside diameter of the small end us-
ing a specific micrometer.
NOTE
Replace the crankshaft if the rod small end diameter exceeds
the standard diameter, shows signs of wear or overheating
Characteristic
Checking the rod small end: Max. diameter
15.030 mm
Checking the rod small end: Standard diame-
ter
15+0.015 +0.025 mm
ENG - 110

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