Lifan 50cc Engine 4 Speed Semi-Auto Air Carby Kit Ignition Coil CDI Regulator. Lifan 50cc Engine (4-Speed Semi-Auto) (w/ Air Carby Kit) + Ignition Coil, CDI, Regulator & Relay. THIS IS AFTERMARKET PARTS FOR HONDA Z50 MONKEY BIKE. Brand New Honda Z50 Lifan 50cc Engine (4-Speed Semi-Auto). Excellent Quality Standard Lifan 50cc Engine (4-Speed Semi-Auto). This Aftermarket Lifan Engine Is To Be Used On Most Original Honda Monkey Z50. Aftermarket Parts for Honda Z50 Monkey Bike. 50mm (L) x 40mm (W) x 30mm (H). Difficult - Professional mechanical & electrical skill required. ...