The F37's aviation-grade motor delivers superior sound, power, and stability in a more compact design. Its shot-peened and passivated housing provides excellent heat and oxidation resistance, with thicker walls for quieter operation.
F37
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Index F37 (Motor Version Air - Cooled 125CC) 10 - inch Engine Type Single - cylinder, four - stroke, forced air - cooled, overhead camshaft Bore/Stroke 52.4 mm/57.8 mm Cylinder Displacement 124.53 ml Compression Ratio 9.8:1 Maximum Power and Corresponding Speed 6.8 kW/7500 r/min Maximum Torque and Corresponding Speed 9.87 N·m/6000 r/min Minimum Fuel Consumption Rate 345 g/kW·h Minimum No - load Stable Speed 1700 r/min ± 100 r/min Ignition/Lubrication System ECU - controlled ignition/Combination of pressure and pressure - splash lubrication Fuel Supply System Electronic fuel injection system Lubricating Oil Filter Model and Type Combination of full - flow filter Cooling Method Forced air cooling Specifications or Requirements Anti - rust and anti - freeze liquid (Unified inorganic coolant at - 45°C) Dimensions (Length × Width × Height) 640 mm × 410 mm × 310 mm Net Weight 31 kg Our advantages
F37 and F39 feature Yueya's unique wind impellers, with perfectly adjusted angle, thickness and gap. Their plastic parts use advanced injection molding for seamless fit, plus better service life, high-temperature and impact resistance.
F37 uses Yueya's unique semi-connection magneto cooling design, with adjusted fan blades, greatly reducing temperature. Even at 150CC displacement, it avoids engine "burning". The new fan impeller efficiently guides air into the wind deflector to cool the magneto.
F37 and F39 feature high transmission ratios with refined transmission mechanisms:higher-quality FPTC balls, new high-temperature/wear-resistant driven wheel friction plates, and overall speed ratio/structural matching for authentic full-machine power.
The new F37 and F39 feature larger drive pulleys than the traditional G-series, improving gear ratio efficiency. This ensures smoother power delivery during shifts, reduces high-RPM engine noise, and enhances acceleration performance. The optimized transmission also maximizes engine output.
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