Quick update, i do not have a hg meter to balance the carbs. what i do have is a hand vacuum gauge for bleeding brakes. This meter measures in pounds. I unscrewed the phillips head screw on the intake pipe into the head and hooked up my vacuum guage. the needle jumps between 16 pounds and 12 pounds on the left carb. On the right carb it jumps between 6 and 3 pounds. I downloaded the high res manual for the cx500 off the wikispaces site and looked up section 3-7 and according to the picture on the bottom of the page there is a adjusting screw with a lock nut on it to adjust the vacuum on the right carb. So, i wandere3d out to my bike and looked, and looked, then i took opff the tank and looked again. no adjusting screw!!! i looked all over and still i found nothing. i checked the id numbers on the carbs and found 25acsj1 on both carbs imprinted on the left side body of each carb... Does anyone know what this is and how i can adjust the vacuum without a adjusting screw....?