Mazda RX-8 Manual page 1031

Clutch disengagement stroke (Reference value)
A: 111.8 mm {4.402 in}
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Clutch Switch Inspection
1. Remove the engine cover.
2. Remove the battery cover.
3. Disconnect the negative battery cable.
4. Disconnect the clutch switch connector.
5. Verify continuity as indicated in the table.
If there is any malfunction, replace the clutch switch.
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(w) RX-8 Transmission (Manual & Auto)
Page 6