That is odd and would be the first I've heard of being wallowed out into an oval instead of a circle. That governor flopping about on the cam shaft would not be good. Would only be a matter of time till it flew off or into pieces or got hung up in the cam or crank and cause major damage. My cousin bought a new mower from LOWE's with a single cylinder B&S engine a couple of years ago. And the first season, with just a couple of mowings on the meter, it started clanging really bad and sounded like a JackAss kicking in a tin stall! She asked me to diagnose it and I said it sounded like something came loose inside the engine, maybe the governor flopping around and should NOT be ran period but taken immediately to the service dealer. Couldn't imagine what could cause such a loud, clanging noise and still run. Didn't sound like a rod knocking. I could have worked on it, but wasn't licensed by the mfg, or LOWE's to do so and would have voided the warranty. Know what was causing all the kicking, IL ENGINE? Cam BROKEN, flopping around in there. I never heard such a loud clanging in all my time working on engines! I don't see how it ran really.