Zongshen 250cc Air-cooled Tricycle Engine

Zongshen 250cc Air-cooled Tricycle Engine(Model:ZS172FMM-3A/CB250)is a robust,single-cylinder,four-stroke power unit purpose-built for heavy-duty cargo tricycles,renowned for its high torque,exceptional durability,low maintenance,and reliable performance in demanding freight and agricultural applications.

Core Specifications

Engine Type:Single-cylinder,four-stroke,inclined,overhead camshaft(OHC),air-cooled

Displacement:249.9cc

Bore&Stroke:72mm×61mm

Compression Ratio:9.25:1

Max.Power:14kW/8500rpm

Max.Torque:18N·m/6500rpm

Ignition:CDI(Capacitor Discharge Ignition)

Starting System:Electric start+kick start(dual-mode)

Transmission:5-speed manual shift(with reverse gear option for tricycles)

Lubrication:Pressure&splash hybrid system

Net Weight:32kg

Dimensions(L×W×H):303×324×429mm

Fuel Supply:Carburetor(EFI optional)

Emission Standard:Euro IV/National IV compliant

Key Design&Performance Features

Air-cooled Efficiency

Optimized with dense,honeycomb cooling fins and engineered air ducts,delivering stable heat dissipation under continuous heavy loads,eliminating coolant maintenance and leakage risks—ideal for rugged,remote operations.

Heavy-duty Torque Output

Tuned for low-to-mid RPM torque delivery,ensuring strong pulling power,easy hill-climbing,and stable performance under full cargo loads,perfectly matching tricycle hauling needs.

Built-in Balance Shaft

Integrated balance shaft minimizes vibration,enhancing operator comfort during long-haul rides and reducing wear on engine and tricycle chassis components.

Wear-resistant Construction

Forged crankshaft,hardened aluminum valves,and premium piston rings ensure extended service life;advanced oil seals prevent oil leakage,boosting reliability in harsh conditions.

Low Maintenance&Fuel Economy

Simplified air-cooled architecture cuts maintenance costs;efficient combustion design delivers fuel consumption≤354g/kW·h,lowering operating expenses.

Tricycle-optimized Adaptability

Supports reverse gear and high-low speed configurations,with reinforced mounting points for stable integration into heavy-duty cargo tricycle chassis.