Hello guys, I had an issue with the idle. And cold start on cold weather. The symptoms were like a vacuum leak. I had repaired and cleaned the carbs, fixed all the rubbers and hosses. And steel has the same problem. Low idle at the start and then very high idle at motor get warm. Yesterday finally I adjust the valves. And I think the problem is fixed. It's very confusing but in the manual, it's written clearyly. To set up an idle you need to check valves first and ignition timing, then you set up the dual Keihin carbs.