Honda EX5D Owner's Manual page 38

Storage
1. Clean each generator component.
2. Check each part according to the maintenance schedule and repair/
service the faulty parts.
3. Replace the engine oil with fresh oil before operating the generator after
storage.
Refer to page 26 for engine oil replacement.
4. Fill the fuel tank with fresh diesel fuel.
5. Disconnect the battery ground cable from the terminal and tape it.
While storing the battery, fully charge the battery once a month.
6. Cover the generator and place it in a well ventilated and dry area.
If the generator is still hot, wait until it cools down cover.
34