Do you know what causes bent push rods? Every time I've seen a bent push rod, I asked the owner does he choke the engine everytime on start up.....They all say yes! It is a little known fact that the choke should not be pulled "UNTIL" the engine begins to spin. The over choking causes a over compression condition that forces the valves to not open therefore bending the weakest part of the valve train, "the push rods". I would try less choke, and a cleaner air filter to allow better air flow.
As for a broken Governor....check your Governor spring, or carb. throttle valve, or even for a vacum leak before you ship it off for more repairs.
The problem that I had with Kawasaki's is....While employed by a JD dealer, I saw alot of low oil pressure problem that caused gaulding on crank mains & rod journals. The warranty restrictions were always problematic and most customers wound up paying a non-covered parts failure bills that never should have been.
I too spent years in the industrial epuipment rental repair shop, I saw Honda's, Briggs, Kohlers, and Kawasaki's, Wisconsin's that took alot of abuse. I had scrap piles of them all, except one....Kohlers. They just worked like mules all the time! I did do maintainance like clock work to them all.
Oh, BTW if you get any moister in your fuel you can do some valve damage too....Check you fuel filters.