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Inspecting The Clutch Drum - Derbi Rambla 250 Manual

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Engine

Inspecting the clutch drum

- Make sure that the clutch bell is not worn or dam-
aged.
- Measure the clutch bell inside diameter.
Characteristic
Clutch bell max. value
Max. value: Ø 135 mm
Clutch bell standard value
Standard value: Ø 134 ÷ 134.2 mm
Checking the bell working surface eccentricity
- Fit the bell on a driven pulley shaft with 2 bearings
(inside diameter: 15 and 17 mm).
- Lock with the original spacer and nut.
- Place the bell/shaft assembly on the support to
check the crankshaft alignment.
- Using a feeler pin gauge and the magnetic base,
measure the bell eccentricity.
- Repeat the measurement at 3 positions (Central,
internal, external).
- In case of anomalies, replace the bell.
Characteristic
clutch bell check: Limit eccentricity.
Admissible limit eccentricity: 0.15 mm
Specific tooling
AP8140915 Crankcase check
ENG - 83

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