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kohler 25 hp mod cv25s: runs very rough if at all. i have to manipulate the throttle and choke constantly to keep it running. i cleaned the carb, changed plugs- fuel filter, air filter and fuel pump. please help!

First of all are you running on both cylinders

http://www.kohlerengines.com/manuals/landing.htm

locate your Kohler engine model, click on service manual, see troubleshooting section