CY R420 Specs

Chung Yang R420 Scooter Mini Chopper Engine

This engine used in many popular scooters, as well as mini choppers.

Model R420
Cooling Type Air Cooled
Displacement cc 41.5
Bore mm 40
Stroke mm 33
Max. Power PS / rpm 4.0 / 11000
Max. Torque kg-m / rpm 0.33 / 8000
Min. Fuel Consumption g/PS . H 360
Max. rpm at no load rpm 18000
Compression Ratio 8.8
Fuel Recommend Octane 95~98
Oil Recommend FC grade 2 Cycle engine oil
Mixture Ratio Pre-mixed (25 Gasoline : 1 Engine Oil)
Ignition Type TDI
Carburetor HDA
Spark Plug Std. NGK: CMR7H
Starter Recoil (EZ)
Clutch In rpm 5700
Stall rpm 7300
Overall Size Length mm 277
Width mm 244.5
Height mm 228
Weight kg. 3.76