Why does your Huskee riding mower stalls after engaging blades?

The seat safety switch is not working properly correctly. If the safety does not sense that there is anyone on the seat then it will shut down the mower. This keeps the mower from running over someone if they would happen to fall off while mowing.

Or if the safety is working you may have bad bearings on your deck and that will also stall your motor, or something jammed in the blades.