<human>:  Can you provide step-by-step instructions for repairing my lawnmower?
<bot>: 
1. Disconnect the spark plug wire from the spark plug.
2. Remove the air filter cover and air filter.
3. Check the spark plug for signs of damage or wear, and replace with a new spark plug if needed.
4. Remove the top bar, handlebar, and recoil cover of the lawnmower.
5. Using a screwdriver, loosen the screws holding the blade in place and remove it.
6. Clean the blade and oil it with petroleum-based lubricant.
7. Reinstall the blade on the lawnmower.
8. Replace the recoil cover, handlebar, and top bar.
9. Place the air filter back into the air filter cover.
10. Reconnect the spark plug wire to the spark plug.
11. Add fresh oil and gasoline to the fill cups.
12. Start the lawnmower to test it.