So I received my authentic Kayfun V5 last week from Origin Vape. I also have experienced the same leakage issues regarding the stock o-ring set. As far as I can tell, replacing the stock set with the replacement kit has fixed the leaking issue. I wasn't getting the kind of vaping experience I expected for the first two days? After leaving it sit overnight, I grabbed my Triade w/Kayfun 5 and was absolutely blown-away by the flavor and vapor production! So, why did it take a full night of sitting to get the kind of performance I expected? I suspect the issue was due to an air lock within the coil chamber. The only logical explanation, is that it took the entire night to let 100% of the air to bleed from the chamber. Before refilling the tank (today), I decided to do a thorough cleaning of the unit. After filling the tank, and opening the JFC to 2 1/2 turns, I'm getting around 50% performance. When I'm successful at remove the air, it functions perfectly. It's hit-and-miss with this thing. Others are telling me that shouldn't be having issues, and that 70% VG is not an issue. I may need to have mine replaced.
Last edited: