Check out a Kohler book at a small engine shop. It may be off of a twin cylinder flatty from Kohler. Some of the info. on Brian Miller's web site is incorrect concerning the sizes of carbs. used on certain K series engines. He is correct on the #26 being the smaller core, but there were more than 2 different carbs. used on the different sizes of K series engines, the 14,16,18hp. K series singles do not use the same carb. from Kohler. The 18hp. single (K361) had the biggest carb. for the K series singles, and there were three different ones from Kohler for that engine.