| Also known as | F6821 |
| Diagram | Fig. 16 — SWINGING FORK AND SUSPENSION UNITS · ref 5 |
| Subsystem | suspension rear |
| Listed in parts books | 1967–1974 |
SWING ARM BOBBIN,650
Swing arm pivot bobbin for the 650 twin, part number 82-6821, formerly listed as F6821.
This is the swing arm bobbin listed for the 650 twin, part number 82-6821, which shows up in older parts books as F6821. It lives in the rear suspension, in the swinging fork assembly, right where the fork pivots on the frame. A bobbin like this is part of the pivot bushing arrangement that lets the swing arm move up and down while keeping things located side to side.
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The catalog record shows this number replacing an earlier factory part, 82-5312, so if your parts book or an old invoice lists that number, it's the same physical piece under its prior identity. It turns up across a run of catalog years from 1967 into 1974, so it's a part that stuck around through several seasons of production without a redesign.
Worn or perished bobbins in the swing arm pivot show up as looseness or knocking back there, so it's worth a look any time you've got the rear end apart. Confirm fitment against your specific machine before ordering since the catalog doesn't spell out finer distinctions beyond the 650 designation.
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