After riding around on fuel-injected sport bikes for years, I told myself that I would never go back to carburetors, but I miss tinkering around with antiques, and I am back to where I started from. I recently acquired a 1982 GL500 Interstate. The bike is running poorly and I believe the problem can be found in the factory carburetors. The GL500 starts and runs, however, when I twist the throttle, the revs go up and stay around 3 or 4 thousand for about 20 seconds. I am beginning to believe the 40 year old carbs need rebuilt. I do not know much about these old carbs but it seems that the carbs are "out of sync." My gas tank is rust free and I am positive that the plastic throttle tube or metal cable is in good condition. I plan to buy Murray's carbs and toss the factory equipment in the trash and never look back. Does anyone have any suggestions that do not include rebuilding the carburetors. Do out of balance carburetors share similar symptoms? Thank you in advance.