First let me preface my question with a little background. I have been working on and riding the Honda 350 twins since they first came out new (with a lot of other bikes thrown ). I have always had trouble with the stock carbs on these bikes as most people seem to have. I have a 1973 Honda CL350 now that I have yet to get to run right on the left cylinder. I have built 3 separate left side carbs for this bike and it still will not run on the left side. The compression is 150 psi, the timing is correct, points have been set right, valves have been set and the plug is firing. I am not a newbie to these bikes and I know how to build the carbs and set it up. It obviously sounds like something wrong in the left cyl, but I can assure you I have checked EVERYTHING I can think of. Also the exhaust is stock and the stock airbox is in place. Any ideas?