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Oil drain plug

What is the reason for the Phillips screw head in the middle of the oil drain bolt. Does it need to be loosened with a Phillips screwdriver prior to opening the bolt manual doesn't say much thanks wanting to drain a bit as it appears that maybe over the top of the fill line

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Motorcycle: 

1 Comment

I would think it's to speed up removal and tightening when you if you don't a socket wrench. It also may be that because the plug is steel and the case aluminum, Yamaha wants you tighten it with a screwdriver to avoid stripping the treads. It's a good idea to change the washer.

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