The spark plugs will require a candle-key on 16, plus a key to 10, to remove the plastic cover of the motor.
The leather is attached to the two nuts that need to be turned off first. After it is removed, it is possible to access the four HV wires, which need to be pulled out by the rubber arrowheads. The spark plugs can then be initiated.
When installing new candles, it is recommended to insert them into the wells already fixed in the candle-key. Otherwise, the candle may fall into the well not precisely, which will lead to the disruption of the threads or the shaving of the gap between the electrodes. After the candles are dizzy and the wires are connected, it is necessary to start the engine-to make sure that it is working. Then it can be secured back and plastic.