valleyboy 1 #1 Posted August 19, 2017 I have a kohler engine which I bought as a K321. It is minus the shroud so I don't have the model number. It has a 3 & 7/16 piston. It has K / 5 cast in cylinder block. Need to know if this is a k321. Bob Share this post Link to post Share on other sites
roadapples 6,983 #2 Posted August 19, 2017 Look behind drive pulley. Mine has K321 cast in the block... Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,033 #3 Posted August 19, 2017 K301 12hp standard bore is 3.375" (.030" over would be 3.405" bore) 3-7/16" is 3.4375" K321 14hp standard bore is 3.500" (.030" over would be 3.530" bore) Garry 1 Share this post Link to post Share on other sites
Ed Kennell 38,022 #4 Posted August 19, 2017 (edited) K-321 piston size S/B 3.494". K-301 piston size S/B 3.375". Garry types faster than Me. Edited August 19, 2017 by Ed Kennell 1 Share this post Link to post Share on other sites
