To check the level of engine oil in a Harley Davidson Sportster without removing the cover or taking off the seat, you can follow these steps:
Locate the oil level sight glass: Look for a small round glass window on the side of the engine. It is usually located on the right side of the bike, near the bottom of the engine case.
Position the motorcycle upright: Make sure the motorcycle is on level ground and is in an upright position. This will ensure an accurate reading.
Clean the sight glass: Use a clean cloth or rag to wipe off any dirt or debris from the sight glass. It's important to have a clear view of the oil level.
Check the oil level: Look through the sight glass while the motorcycle is upright. You should be able to see the oil level inside the engine. The oil level should be between the minimum and maximum marks on the sight glass. If the oil level is below the minimum mark, you will need to add oil.
Add oil if necessary: If the oil level is below the minimum mark, you will need to add oil to bring it up to the correct level. Refer to your motorcycle's owner's manual for the specific type and amount of oil to use. Typically, Harley Davidson motorcycles use synthetic 20W-50 motor oil.
Note: It's always a good idea to consult your motorcycle's owner's manual for detailed instructions and specific information regarding your particular model of Harley Davidson Sportster.