I'm having issues with my 1974 tx500 as well, yesterday i was riding and as i was slowing down my shifting to 2nd and 1st my bike started stalling and smoke came out the left side of engine . I just got the carbs tuned and oil filter replaced and new plugs, but my bike seems to rev at high RPM's when i apply the clutch and hangs there when I'm in 4th or 5th gear, and the left carb is leaking from that spot in the image but like i said the left carb, any help would be appreicated,