163fml Engine Manual Jun 2026

The side cover screws are M6. Do not exceed 10 Nm or you will strip the case.

The 163FML is a clone of the engine family. Therefore: 163fml engine manual

| Symptom | Likely Cause (per manual) | Solution | | :--- | :--- | :--- | | Hard to start cold | Valve clearance too tight | Adjust to 0.08mm intake/0.10mm exhaust | | Backfiring on decel | Exhaust leak or lean pilot jet | Check gaskets; adjust carb air screw (1.5 turns out) | | Overheating | Low oil or retarded ignition timing | Top up oil; check stator plate position | | Clutch slipping | Wrong oil (energy-conserving car oil) | Flush and refill with JASO MA oil | | No spark | Stator coil failure (common) | Test resistance: red/black wire 250-350 ohms | The side cover screws are M6

If you need a 163FML engine manual, you can obtain one from: Therefore: | Symptom | Likely Cause (per manual)