Summer of '81 Dad had a really tired 10 hp in a 104 as his mowing tractor. I called someone at IH Louisville involved with Cub Cadets and got the name and phone number of Kohler's salesman that called on IH. Think he quoted around $200 for a new complete engine minus muffler, pto clutch & S-G, which was a $300 engine across a dealer's parts counter. I said I'd pick it up, he lived in rural Sheboygan, gave him my work phone number and waited for his call. Month later I get a message on my phone mail, I call him back, engine is done, painted CC yellow, he later cautioned me to pull the engine apart before rebuilding it, it "MAY" have special parts in it, was assembled in Kohler's Engineering lab.
Wife and I had a real nice drive from the Quad-Cities to Sheboygan, had lunch at Pizza Hut, followed his directions to his farm, paid him for the engine an a $50 tip for his work and my 7 month pregnant wife and I headed for home. Dad didn't install that engine for several years. It was still in the 104 he sold at his last auction July of 2006, it was one of 8 Cub Cadet's on the sale bill. The tired 10 hp has now been rebuilt TWICE, and is in the 1965 #70 Dad bought brand new. It was rebuilt right away as soon as I got it and installed in my#72 for 20 years and 1400 hours. It was used at MANY CC plow days.
Every IH dealer had a Kohler engine painted yellow and sometimes black sitting on the parts counter back in the 1960's & '70's. The #70's original engine was rebuilt once by the dealer, 2nd time by Dad as I watched, then replaced with a K-181. I'm not at all sure where the K-181 came from that I took out of the #70, looked like Wheel Horse tin or something.