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  
  Engine Type  Air-cooled 4-stroke OHC single   
  Engine Displacement  71.8cc   
  Bore & Stroke  47 x 41.4mm  
  Compression Ratio  9 : 1  
  Carburation  13mm piston-valve carburettor  
  Max. Power Output  N/A  
  Max. Torque  N/A  
  Ignition Capacitor Discharge (CDI)   
  Starter  Primary kick     
  
Transmission  
  Gearbox  3-speed with automatic clutch  
  Final Drive  420 roller chain; 15T/36T  
  
Dimensions and Weight  
  Length x Width x Height  1,569 x 694 x 885mm  
  Wheelbase  1,063mm  
  Seat Height  655mm  
  Ground Clearance 178mm   
  Fuel Capacity  5.5 litres (including 1.1-litre reserve)   
  Dry Weight 58kg      
  
Wheels, Suspension and Brakes  
  Wheels Front Steel rim/wire spoke  
  Wheels Rear  Steel rim/wire spoke   
  Tyres Front  2.50 14 4PR  
  Tyres Rear 3.00 12 4PR   
  Suspension Front 27mm leading-axle telescopic fork, 100mm axle travel  
  Suspension Rear  Mono-cushion swingarm, 90mm axle travel  
  Brakes Front 95mm leading/trailing drum  
  Brakes Rear  95mm leading/trailing drum