Small Engines (Lawn Mowers, etc.): Exhaust valve lifts during compression, craftsman eager 1, proper manuals

Question
Craftsman Eager-1 6.75 horse mower. Big problem starting lately. While fighting into the night, I finally got it running and because it was now dark outside, I noticed flames coming out of exhaust. Finally ran smooth, let it run for an hour. Turned it off, tried to restart again, no luck. I pulled the head off and noticed that when the piston is in the compression stroke, the exhaust valve lifts ever so slightly, which I don't believe it should if I remember my car repair days of the 60's. Is the mower different than a car and is it supposed to do that? I took out the lifter spring, thinking maybe it was broken, but it is fine.  ~John

Answer
Hello John:

This Engine May have the Compression Release System for Easy Start. Set the Valve Clearance to the Following: Intake is .002in - .004in and the Exhaust to .080in - .010in.Send me the Model Numbers Off the Mower or the Engine, Please. With these I can Locate the Proper Manuals and Better Assist you. Hope this Helps. I am here if you Require more Assistance. Let me know what Happens, Please. Thanks.