Valve Issues

• 1). Remove the four bolts which secure the cylinder head cover in place and lift the cylinder head cover off in order to gain access to the engine valves.
  
  
• 2). Turn the cooling fan on the camshaft, before aligning the mark on the fly wheel (which is a "T"-shape) with the mark on the crankcase.
  
  
• 3). Crank the jam nut counter-clockwise with a wrench in order to loosen it, and then rotate the adjusting nut to adjust the gap between the valves. It is vital that gaps for the engine valves are set to 0.05mm or .00197 of an inch.
  
  
• 4). Replace the jam nut and refit the cylinder head cover and tighten the four bolts with a wrench.
  
  

Idle Speed Problems

• 1). Start the engine and check the RPM (revs per minute) of your scooter, without moving. Normal idling parameters are between 1,900 and 2,100 RPM. So anything other than this will have to be remedied in order to ensure your GY6 motor works properly.
  
  
• 2). Remove the four bolts which secure the cylinder head cover in place and start your engine, giving it minute or so to warm up.
  
  
• 3). Turn the carburetor adjustment screw 1/4 turn to the left or right to adjust the idle speed. This is a case of trial and error, and you should turn the screw until the RPM falls in to the optimum idle speed.
  
  
• 4). Turn off the engine of your scooter and replace the cylinder head cover before you use the scooter in normal conditions again.