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I'm going to guess the kick back comes from a flooded rich mixture. 1) Piston goes up, fuel ignites and burns very slow as the piston goes down 2) exhaust port and transfer ports open adding more fuel and air, AND disturbing the flame front causing a faster burn 3) Piston goes back up, closes...

Opening the cap on they way to the job prevents pressure from forcing gas through the carb (probably due to a carb with imperfect seals) Too much carbon buildup in the cylinder may have increased compression way too much. Hydro lock would probably not feel like kick back, but just plain...

Sounds too rich when starting? Use less choke or no choke. I had a wood splitter do that a lot, and what I found was that it was loading up on fuel, and I had to start it with no choke or as little as I could or I wouldn't get it started for a week. Not hydro locking, which literally locks the...