_Sticking valves._--With the inlet valve this trouble may be caused by oil and dirt. If this is the case it can be taken out and washed in petrol and replaced. The car may not run as it should do on account of the inlet and exhaust valves being pitted and needing grinding in. To grind in use a little emery-powder and oil, and plenty of “elbow grease” until you succeed in eliminating all the little pits and making the surface quite smooth. (Be careful to clean off all traces of the emery after grinding.) _Platinum point and screw adjustment._--The platinum point on the trembler blade or screw occasionally gets worn uneven. When contact is made, if the adjustment is not correct, the point will get worn down on one side and the engine will probably develop a “knock” and you will not be getting the maximum horse-power out of it. It is a simple matter to smooth the points, but a delicate touch is necessary. The filing must be done with your finest file, and a very few touches are necessary. Should you not happen to have a very fine file with you, the points can be smoothed with emery-paper, but care should be exercised in its use. Again let me warn you to have the electric current switched off before making any of these repairs or adjustments, and particularly before removing the trembler blade, screw or plug. When the trembler blade and screw are replaced they will require readjustment. When you think they are set at the proper point, switch on, and give the starting-handle a few turns as if to start the engine, at the same time hold down the inlet valve, by pressing down the small button on top of cylinder. While turning, watch the spark between the two points. If it is feeble the adjustment is not correct, the screw is either tight or too loose. After a few attempts you will be able to adjust very quickly and almost unerringly. See that the points are kept free from oil. _Loose terminals._--The car may run badly on account of a loose terminal of the wires on the sparking-plug or battery. This is simply a matter of thoroughly tightening up the various little nuts with a spanner. It is a good plan to just look over these occasionally, for when the terminals once begin to work loose they will gradually get worse and you will probably have a stop on the road. _Irregular petrol-supply._--If the carburetter is getting too much or too little petrol, it should be remedied by readjusting the needle valve in the carburetter. When once it is properly set it will sometimes go for years without readjustment.