Possible answers:
[1]. Park the mower on a suitable work surface. Raise the mower deck to its highest setting to make it easier to access the blades..
[2]. Inspect the factory blades in your area. Remove from the factory blades pre vin (owner's manual) and replace it with a new one in the same condition..
[3]. Use a small wrench to twist off snow plugs to verify they are back in place. Reconnect spark plug hoses to their positions..
[4]. Examine the operation of your mower blades. If they look one shade hotter then their previous degree (up to two's), it might be worth changing them..Choose from options above and answer: What most naturally follows?

How to change the blades on a riding lawn mower
Check the condition of your mower blades to see if they need changing.
Turn it off and lock the brakes or chock the wheels. Disconnect spark plug (s).
Answer:
[1].