I've only had to replace a Crank on 6 other engines and 4 of those were out of K161 and k181 blocks. Other 2 were K301s out of blown up Cub Cadets. I've worked on every single cylinder from K91-K341 including 2 very early (pre 1964) (I hate to say it but they are "rare") 2 7/8" small bore K181s that I call K141/k161 strokers because they use a standard K181 crank and rod in a small bore K141/K161 block. The 2 7/8" bore blocks are hard to find rings for but I found someone across the pond in Greece that makes custom sized rings reasonable.
This fella can make rings for pretty much any small engine if you give him dimensions.
Looks like any 3 1/8" keyed x 1.125 Crank from K301-K361 will work. Kohler 45 142 21-S is the crank that I need. Gota love how they measure them by Inch Fractions and Decimals in the manual lol.
Found 1 reasonably priced on Ebay that I'm going to ask him to measure the Journal on. $65 shipped isn't bad if it's a good crank.
Edited by EricFromPa, January 31, 2018 - 04:28 PM.