Harry M:
I'm going to repost a comment I made last winter that may enlighten you and the others that haven't lived with a Kohler powered Cub in cold weather - the routine may help you and also this post will explain why it "sounds funny" (firing with the ACR holding the exhaust valve open partially) when cranking.
"I was getting the 129 out to clean up the driveway this afternoon, and as it had set for about 6 days in the unheated barn, I had to run through my cold weather starting routine. Got me to thinking, both motors I've had in the 129 (this covers more than 22 years) started exactly the same way in very cold (let's say 15 degrees or colder)weather. Most of this is due to the speed that the automatic compression release kicks out at, but once I learned it's routine, I've very seldom had to resort to a battery charger (two batteries in 22 years, also). If you just open the throttle and pull the choke out, it'll crank until it fires, but it's jussst at that speed that it'll kick back on the starter rather than start. Now, if you open both and as you crank, start pushing in on the choke, usually by the second or third revolution, it'll start firing and usually catch. If it kicks back, you start all over again, throttle open, choke open and start closing the choke as you crank it."
Now I have to admit, putting a block heater on the transaxle rear plate has helped, but just yesterday morning, I hopped on the 129 (well, I actually strolled over to it and slowly swung my leg over the seat..) and went through that same starting routine as described, with no block heater, or battery charger. It kicked back about a half dozen times, but caught and started after that..same routine (full throttle, full choke, start pushing the choke in as it cranks) -now 23 years....