The derby is the cover on the left side of the bike where the primary oil goes. It'ts called a derby cover,
The "Derby" is the large dome-shaped cover on the primary. The primary is on the left side of the engine. Be VERY careful when removing the derby fasteners. The screws on the derby are very prone to stripping. Insure that any tool is inserted all the way to the bottom of the slot before placing any force on the fastener.
Harley Davidson "Derby Cover"A "Derby Cover" is basically a dust cover. It's on the left side of your bike and covers the business end of your clutch. It's the larger cover with (usually) 4-6 screws holding it in place. However my '85 Sportster has no screws in the "Derby Cover". Instead there's a two inch (2") screw-cap in the center of my "Derby Cover" with a large closed slot in the center. That's it! there are no other screws holding it in place.
All Sportsters have 4-stroke motors.
remove the derby cover from the primary. Fill until it tries to run out. Replace derby cover.
remove the derby ( round ) cover from the primary. fill til it tries to run out. replace derby cover.
remove the derby (round) cover from the primary. fill until the fluid tries to run out. replace the derby cover.
the large round cover on the rear of the primary three screws over the clutch
** No. I believe all sportsters from the mid \'90\'s have had belt drives.
The cover over the points / timing set plate on the right side of the bike.
Beginning with the 2007 model year, all Sportsters were fuel injected.
On all Harley Big Twins from 1970-up that use a sealed chaincase, primary oil is added by removing the derby cover, also known as the clutch inspection cover. On your bike it's the large round cover with five screws around its perimeter. The factory recommends replacing the derby cover gasket whenever that cover is removed, but you may find it's not necessary.