Cylinder head straight plug

When taking off the cylinder head I noticed the plug between the cam right in the middle of the head. I first tough I had to loosen it. After checking in the manual there was nothing on this plug. I checked on the yamaha site and found this info, part # 90340-12112-00 PLUG, STRAIGHT SCREW .

I already started to loosen it, just a bit. I retighten it to about 30 ft/lbs. What would be the proper torque ?

What is this plug for ? Is this plug part of the coolant system ?

Can this plug be unscrew without damaging the head ?

Do I have to completely take it off to reapply some sort of sealant ?

Thanks

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