jonepeer 2 #1 Posted July 7, 2016 How do I adjust my carb on a 20 HP Onan that is running rich? Share this post Link to post Share on other sites
lynnmor 7,843 #2 Posted July 7, 2016 The only mixture adjustment is the idle mixture screw. At slow idle, turn it for best idle. If it speeds up too much, adjust idle speed down and repeat as necessary. My guess is that you might have other problems. Like your hat. 3 Share this post Link to post Share on other sites
jonepeer 2 #3 Posted July 7, 2016 Thanks lynnmor for the info and the complement 1 Share this post Link to post Share on other sites
