Honda has released a Service Bulletin for the HRR216VKA and PKA mowers to resolve a "Engine Won't Restart" issue.
ONLY mowers within the following range are affected: MZCG-8400001~MZCG-8669999.
If you have a mower in the affected range, and it has this problem, and is still under warranty, Honda will typically pay for the repairs. Delivery and pick-up of the mower to and from a Honda dealer is not included. You can find a dealer in your area at this link:
Ask about Honda Lawnmower Service Bulletin #98, if your dealer isn't aware of it yet.