Engine cranks but won’t start

• No fuel in tank.
  

  
  

   

• No fuel to carburettor.
  

  
  

   

• No spark at spark plug.
  

  
  

   

• Clogged air cleaner.
  

  
  

   

• Intake air leaked.
  

  
  

   

• Improper throttle operation.
  

  
  

   

• Compression too low.
  

  
  

   

• Contaminated fuel.
  

  
  

• Faulty auto by starter.
  

  
  

   

• Clogged idle system or auto by starter passages.