1/4 20 x 5/8
4x4
What is a primary mount? You have an inner primary, outer primary, inspection cover, and derby cover.
The derby is the cover on the left side of the bike where the primary oil goes. It'ts called a derby cover,
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.
most likely a 10mm or a 3/8"
count the number of bolts on the differential cover. this will determine the size
remove the derby cover from the primary. Fill until it tries to run out. Replace derby cover.
10mm or 12mm metric 10mm or 12mm metric
remove the derby (round) cover from the primary. fill until the fluid tries to run out. replace the derby cover.
remove the derby ( round ) cover from the primary. fill til it tries to run out. replace derby cover.
the large round cover on the rear of the primary three screws over the clutch
Yes, all Harley-Davidson Sportster models have a derby cover. The derby cover is a decorative and functional component that covers the primary drive system, allowing access to the primary chain and clutch for maintenance. It is typically located on the primary case and is an iconic feature of the Sportster design.