Fault Phenomenon: Foton Raysta L10 starts smoothly when cold. After frequent starts (operating temperature), the clutch chatters, power transmission is uneven, and eventually slips.

Troubleshooting Process:
– Checked clutch disc: friction disc thickness normal, no oil contamination.
– Checked pressure plate: surface flat, no burning.
– Checked release bearing: bearing turns freely.
– Measured flywheel end face runout at operating temperature: found excessive runout.

Root Cause: The flywheel deforms due to heat, causing uneven clutch engagement.

Required Parts: Flywheel assembly and clutch kit.