Lifan 125cc Motorcycle Engine – Compact Power, Big Reliability

The Lifan 125cc engine is a compact, 4-stroke engine known for its durability, smooth power delivery, and excellent fuel efficiency. It’s widely used in pit bikes, scooters, ATVs, and custom builds—making it one of the most popular small-displacement engines on the market.

🔧 Key Specifications:

Displacement: 124cc – 125cc

Engine Type: Single-cylinder, 4-stroke, air-cooled

Bore x Stroke: ~52.4mm × 55.5mm

Compression Ratio: Approx. 9.0:1

Max Power: ~8–9 hp @ 7500–8500 rpm

Max Torque: ~8.0–8.5 Nm @ 6000–7000 rpm

Starting System: Kick start (some versions with electric start)

Transmission: 4-speed manual (N-1-2-3-4 or 1-N-2-3-4 pattern)

Fuel System: Carburetor (some models available with EFI)

Cooling: Air-cooled

Ignition: CDI

⚙️ Key Features:

✅ Great for Small Bikes & Builds

Common in dirt bikes, pit bikes, go-karts, and minibikes

Lightweight, making it ideal for compact frames

✅ Reliable & Long-Lasting

Strong cast construction and dependable cooling

Handles long use with minimal maintenance

✅ Fuel-Efficient Performance

Low fuel consumption with solid low-end torque

Excellent for beginners or light commuting

✅ Widely Supported

Easy to find replacement parts and upgrades

Supported by a large community of builders and mechanics

🧰 Perfect For:

Pit bikes (e.g., CRF50/70 frame)

Go-karts and ATVs

Mini choppers or custom small motorcycles

Beginners and hobbyists