Usually it is a quite troublesome job to change the valve spring, the technician must remove the cylinder in order to remove and replace the valve spring.
With our brand new products – valve spring changer, the job couldn’t be easier. , only need to remove the engine cover and the spark plug , install the valve spring changer firmly on the engine, force the compress air into the cylinder head which will push the piston to the highest position so the valves are fixed in position. Then use the spanner and the socket on this special tool to change the valve spring.