It is important to set the spark plug gap correctly in order to ensure that the engine runs properly. If the gap is too small, the spark will not be able to jump across the gap and the engine will not start. If the gap is too large, the spark will be too weak and the engine will not run smoothly.
To set the spark plug gap, you will need a feeler gauge. Insert the feeler gauge between the center electrode and the side electrode of the spark plug. The feeler gauge should just slide through the gap without any resistance. If the feeler gauge is too tight, use a spark plug wrench to carefully bend the side electrode until the gap is correct.
Once the spark plug gap is set correctly, reinstall the spark plug and tighten it to the specified torque. The torque specification for the spark plugs on a 2005 Honda Shadow Spirit 1100 motorcycle is 18 ft-lbs (24 Nm).
