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Lifan 1p54fmi Service Manual Site

Lifan 1P54FMI

The is a popular 125cc horizontal, single-cylinder, 4-stroke air-cooled engine. Widely used in pit bikes and small motorcycles, it is known for its durability and ease of maintenance. Engine Specifications Specification Type Single-cylinder, 4-stroke, air-cooled, OHC Displacement Bore x Stroke 54mm x 54mm Compression Ratio 9.0:1 to 9.47:1 Max Power ~8.72 HP @ 7,500 RPM Ignition System CDI (Capacitive Discharge Ignition) Transmission 4-speed manual clutch (typically N-1-2-3-4 or 1-down 3-up) Routine Maintenance & Service Intervals

  • Fuel System: Check for clogged pilot jet in carburetor; verify fuel flow to tank.
  • Ignition: Test spark plug; test CDI unit and Pulse Trigger (Pickup coil). Resistance for pickup coil is typically ~100-150Ω.
  • Compression: Perform leak-down test; verify valve clearance is not too tight (holding valve open).

: Clean and lubricate the chain weekly. Ensure proper tension—there should be about 15-20mm of "slack" to allow for suspension travel [4, 6]. Common Troubleshooting Low Compression lifan 1p54fmi service manual

Loc-Tite:

These engines vibrate significantly. Use blue Loctite on non-engine-case bolts (like footpegs and exhaust mounts) to prevent them from falling off. Lifan 1P54FMI The is a popular 125cc horizontal,