| Also known as | 57-0500, T4055 |
| Diagram | Fig. 9 — GEARBOX INNER COVER AND SELECTORS · ref 17 |
| Subsystem | gearbox |
| Listed in parts books | 1960–1962, 1964–1965, 1967, 1970–1972 |
CAM PLATE TRIUMPH 650 4 SPEED GEARBOX - Replaces 57-3650 57-0500 - May required changing plunger spring - some years
Cam plate for the Triumph 650 four-speed gearbox, part of the selector mechanism inside the inner cover.
The cam plate is part of the selector mechanism inside the gearbox inner cover, the piece that translates movement from the selector fork shaft into the specific gear engagement pattern of the four-speed box. As the gear lever moves, the cam plate rotates through its indexed positions, and the plunger and spring assembly seats into those positions to hold each gear selected until you shift again.
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This number, 57-4055, replaces the earlier 57-3650 and 57-0500 part numbers, so if your parts book or an old box shows either of those, you're looking at the same physical piece under an older number. The catalog notes that swapping to this cam plate may call for a different plunger spring on some years, so it's worth checking that detail before you button the inner cover back up.
Our records show this one turning up in gearbox inner cover and selector listings across the early 1970s. If you're rebuilding a box from that era, it's worth having the old cam plate on the bench next to the new one to compare wear on the indexed profile before you commit to the swap.
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