I am ready to repower my 1886-01. Can someone look over the attachment and confirm, engine/harness/pto shaft/exhaust going to work out ok? Seems to me yes, but not totally sure. I can really use some help here. This is my first go around. Its probably overkill, but that's how I roll!! Also going to need a pair of those fatty front rims and tires!!
You can make a lot of different engines fit in the Bolens... there's a lot of space under the hood, especially if you use a smaller fuel tank. The Kohler will probably bolt right in to the mounting plate, but I'm pretty sure it's crankshaft centerline is lower than the K482 in the 1886. This will probably require some adaption so the drive line doesn't contact the treadle pedal cross shaft. As for the rest of the items, I have no clue as I haven't ever used a store-bought wiring harness for a GT transplant. Ditto for the stub shaft, etc.
Most people make some basic measurements of the engine compartment "envelope", then select an engine. After getting the engine, they then start looking at what will work for stub shaft, wiring, etc.
There is a post somewhere here on GT Talk where a person repowered a Bolens 1886/HT with a Kohler or Briggs V-twin and it came out nicely.
I used to have an 1886-01, and now have an HT23 that I'll be putting a diesel in... the driveline/cross shaft interference issue is one I'm wrestling with right now.
Good luck on your repower... post some pictures of your machine.