If you adjust the carb just go 1/4 turn one way and see what happens. If you only make small adjustments and keep track of them, you can always go back. Don't be afraid. The Kohler manual should give you the factory starting settings. I know they are in my Cub Cadet Manual. Here's the Kohler manual. http://www.kohlerengines.com/onlinecatalog/pdf/tp_2379.pdf Go to section 6. Page 6-27 or so.