Lots of people have had problems with the cam shaft. Honda recently changed their process (materials?) when manufacturing the camshaft which is a composite material. As a result the cam is failing right out of the gate. If someone has better facts on this cam issue please jump in.
I’ve replaced the cam twice on other peoples mowers and they work fine now. I’d say the only issue I’ve seen with the recall is people have dropped in new cams not realizing the timing marks must be aligned then gave the mower back to the customer without first running the thing to make sure the engine is operating properly.
The manufacturing process has been corrected and replacing the cam is a very simple process. My HRR is over ten years old and has the composite cam. Just did a valve adjustment and it has zero wear so it’s obvious if made properly it will hold up just fine.