| Also known as | T731 |
| Diagram | Fig. 11 — GEARBOX SHAFTS AND GEARS · ref 29 |
| Subsystem | gearbox |
| Listed in parts books | 1960–1962, 1964–1965, 1967–1974, 1976–1980, 1983, 1985 |
RATCHET GEAR KICKSTART 650/750 (ONE THAT IS FIXED TO MAINSHAFT)
The kickstart ratchet gear fixed to the mainshaft in Triumph 650/750 gearboxes, part of the starting mechanism.
This is the kickstart ratchet gear that's fixed to the mainshaft, part number 57-0731, listed in the parts books as T731 before the numbering switched over. It's part of the starting mechanism inside the gearbox, working alongside the kickstart quadrant and pinion to turn the mainshaft over when you swing the kickstart lever down.
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The catalog description ties this specifically to the 650 and 750 gearboxes, and it shows up across a long run of gearbox shaft and starting mechanism figures. Because it's fixed to the mainshaft rather than the sliding pinion, it takes the abutment load when the ratchet teeth engage, so if the kickstart is slipping or not catching cleanly, this gear and its mating pinion are the first things worth pulling and inspecting.
Given how central this piece is to the starting mechanism, it's worth checking the condition of the mating parts in the same assembly while you're in there, rather than swapping this one gear in isolation.
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