2012 HONDA CRF50F, ngine Engine Type: 49cc air-cooled single-cylinder four-stroke Bore And Stroke: 39.0mm x 41.4mm Compression Ratio: 10.0:1 Valve Train: SOHC two-valve Induction: 13 mm piston-valve carburator Ignition: CD Drive Train Transmission: Three-speed with automatic clutch Final Drive: #420 chain 14T/37T Chassis / Suspension / Brakes Front Suspension: Inverted telescopic fork 3.5-inch travel Rear Suspension: Single-shock 2.8-in. travel Front Brake: Drum Rear Brake: Drum Front Tire: 2.50-10 Rear Tire: 2.50-10