What is this plug (on right rear of engine)

[Willtill]

I think that I have a very minute (very tiny) loss off coolant coming out of this plug on the right rear of the engine's crankcase. I'm not sure what this plug is for; can it just be simply tightened a bit more?

The plug is in the very middle of the pic below:

 

[Gothlander]

That is just a plug for the water jacket, mine leaked a bit so I just tweaked it a bit and stopped the leak. It hardly moved when I done it but it worked.

 

[Willtill]

Thanks Goth. Now I need to check if I have the bit needed to tighten her down. Looks like a Torx bit.

 

[Gothlander]

From memory it's a 14mm hex head (allen key) type.