Magnum 16 narrow base block. I have one of those ignition modules sitting in a filing cabinet in my little shop.
Atleast it is a narrow base block with an aluminum oil sump. lol A wide base block with cast oil sump weighs another 20-25 pounds. Still around 110lbs and a bit awkward to lug around.
They are pretty simple to work on but pretty damn heavy. Atleast you can rebuild them and bore them a couple times once they wear out. Bad thing about an older Kohler engine is that once the rings get worn down the piston tries to cock sideways in the bore. This causes the sharp edge of the rings to literally scrape metal off of the cylinder. Seen alot of old Kohlers with Egg shaped cylinders over the years.
I've bored a couple on my uncles old Bridgeport mill with a boring bar but for the cost of having a reputable machine shop bore an engine .010, .020 or .030 over sized, it's not worth my time. Heck it takes a good machine shop only around 20-30 minutes to bore and hone a single cylinder engine. They charge by the number of cylinders and the dept of cut so usually around $75-$80 on the high end to have it done by a pro. I've rebuilt dozens of old Kohlers and worked on hundreds. It's very satisfying the 1sy time you get them cranked up and running like a swiss watch again.