1. First remove the Electrical connections by release the button to unlock them without pull them harshly. Gently remove the Bolts to make loose and take out the spark plug coil.
2. Remove the coil assembly and set outside. Now remove the existing spark plug and be careful to do not strip the thread out of the spark head.
3. Now Fix the new Spark plug with gentle and avoid over tighten the plug to don't let to strip the thread. Put the coil again into the hole and push it well as for as you can.
4. Repeat the above same methods for all the cylinders.
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