One thing to be wary of is if you ride in a damp climate it would appear that the lhs spark plug coil can become stuckfast due to sheath corrosion. This happened to mine and needed significant brute force to extract it , breaking its mounting flange in the process. I had a spare to hand, as it was clear it was stuck from a pre plug removal check. Its replacement also fixed a slight hesitancy my bike had, as it was probably running on 3.5 plugs or 1.5 cylinders due to the corroded spark plug coil.