Count the grooves from the blunt end. Can you post a pic of the pipes? I installed mine just like toomey said, and mine runs great. 280 mains, stock pilots, about 1 turn out, and 32:1 Klotz. Also, I didnt' have any problem with the pipes fitting, although they were a little close to the frame under the seat. As far as the leaking, where does the hose go to? You also should do a plug chop.