Removing The Cylinder-Piston Assy; Inspecting The Small End; Inspecting The Wrist Pin - Derbi GP1 50 cc Workshop Manual

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EMOVING THE CYLINDER EMOVING THE CYLINDER
- Carefully remove the cylinder.
- Remove the split rings and the wrist pin.
CAUTION
ALWAYS REPLACE THE WRIST PIN SPLIT RINGS WITH NEW
ONES
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NSPECTING THE SMALL END NSPECTING THE SMALL END
- Using an inside micrometer, measure the small end dia-
meter
N.B.
IF THE SMALL END DIAMETER EXCEEDS THE MAXIMUM ALLO-
WABLE VALUE, OR IF IT SHOWS SIGNS OF WEAR OR OVER-
HEATING, PROCEED TO REPLACE THE CRANKSHAFT AS DES-
CRIBED IN THE CHAPTER "CRANKCASE AND CRANKSHAFT".
Characteristic
Standard diameter
17+0,011-0,001
Max. allowable diameter
17,060
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NSPECTING THE WRIST PIN NSPECTING THE WRIST PIN
- Check the wrist pin external diameter using a micrometer.
Characteristic
Wrist pin: standard diameter
12 +0,005+0,001 mm
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PISTON ASSY PISTON ASSY