If the deck is too low and the grass is too tall, the yes, it could be too much load for the blades/engine to handle.
Raise the mower deck a few positions.
Be sure the throttle is always in the FAST position when mowing and engaging the blades.
Engage the blades when NOT in the grass, then drive it slowly into the grass.
The mower has a 21" blade, but try cutting about half that if the grass is really tall or thick.
If your grass is short already, and you don't think the engine stalling is normal, it's possible the clutch is worn or the engine is running too slow. A Honda dealer can use a tachometer to verify the engine speed and determine if the clutch is working properly.
Caveat: I work for Honda, but the preceding is my opinion alone.
This message was modified Aug 18, 2013 by a moderator