Ok so I got an OFNA Ultra LX 2 about 2 months ago. We'll about two weeks ago that it started leaking a black fluid right under the cooling head and on top of the engine like right in the middle. So I tightened the screws and ran it it stop leaking. So about two days later I ran it again but I made sure I tightened it well but after I was done there was even more liquid right under the cooling head and I have no idea why please help me out!