Kohler CH18s leaking oil from front and rear oil seals
New member here. This might be a long post so bear with me. I was given a 1995 Cub Cadet 2185 lawn tractor with a Kohler CH18s spec 62509 624 cc v-twin. I had to buy a used head to put on one of the cylinders as it was missing the head. When I took the engine off and took the shroud off, the inside of it was caked with dirt and oil. Cleaned up and put everything back together. Run good for a while then I started to notice oil on the back of the muffler box. Found oil leaking out of that seal. Checked seal under the flywheel and saw that it was leaking also. While I have the engine apart should I check or replace anything else? Why would the intake port have black carbon inside it on the cylinder that I did not replace the head or head gasket? I have not done a leak down or compression test as yet. Don't want to have to take pistons and stuff out if I don't have to. Any help I can get would be greatly appreciated.
Plan to blow snow with it next winter if everything is OK with it.