No other solution than good preventative maintainence. The clicking is the solenoid firing, but as the starter motor draws too much current the solinoid closes. Now with no draw from the starter motor the solinoid can fire again with a click and so it repeats.
A good circuit with no corrosion and a healthy battery and a well greased starter motor are all part of the solution. My fag lighter connection was poor on the ctek meaning a less than chipper battery. It has worked ever since, so I will switch to eyelets direct to the battery
