The engines are the same. Just like a k301 is the same as a k341 (12 hp and 16hp) only difference is the carb. I know an older guy that worked for Kohler, Briggs, and Tecumseh back in the day. And he told me all about this. All though I don't think Kohler has ever made a 15. Probably a 14 or 16 hp carb on a 18 hp engine.
|