These starter machines provide plenty of excitement without being
  scary. Having unburstable and economical engines both the CRF70R and CRF50 are
  the perfect introduction.

Engine Type Air-cooled 4-stroke OHC single  
  Engine Displacement  71.8cm3  
  Bore & Stroke  47 x 41.4mm  
  Compression Ratio  9.0 : 1  
  Carburation  13mm piston valve type   
  Max. Power Output  30.5kW/6,000min -1 (95/1/EC)   
  Max. Torque  51Nm/5,000min -1 (95/1/EC)   
  Ignition CDI   
  Starter  Primary kick   
Transmission
  Gearbox  3-speed with auto clutch   
  Final Drive  Roller chain   
Dimensions and Weight  
  Length x Width x Height  1,565 x 694 x 881mm    
  Wheelbase  1,067mm  
  Seat Height  655mm  
  Ground Clearance 162mm   
  Fuel Capacity  5.6 litres (including 1.1 litre reserve)   
  Dry Weight 59kg  
Wheels, Suspension and Brakes  
  Wheels Front Steel rim/wire spokes   
  Wheels Rear  Steel rim/wire spokes  
  Tyres Front  2.50-14 4PR  
  Tyres Rear 3.00-12 4PR   
  Suspension Front 27mm leading-axle fork, 100mm axle travel   
  Suspension Rear  Mono-cushion swingarm, 100mm axle travel   
  Brakes Front 95mm Leading/trailing drum  
  Brakes Rear  95mm Leading/trailing drum