Here is a suggestion for the tower muffler. As mine heats up, the joints seem to loosen up and allow the center tube to leak. I sealed mine up with high temp silicone. (just a thin coating) Since doing this, my OS 50 transitions much better and will provide unlimited vertical on my profile plane. Also check for leaks in the fuel line between the clunk and the cap. I had one with a bad pick up line, I would die when the fuel got below the leak. Took me a month to figure that one out.