| Also known as | T730 |
| Diagram | Fig. 11 — GEARBOX SHAFTS AND GEARS · ref 28 |
| Subsystem | gearbox |
| Listed in parts books | 1960–1962, 1964–1965, 1967–1968, 1970–1974, 1976–1980, 1983, 1985 |
Kickstart pinion
The kickstart pinion that engages the gearbox mainshaft when the kickstart lever is used.
This is the kickstart pinion out of the gearbox, part number 57-0730, also cataloged under the older T730 designation. It shows up in the parts books under the gearbox shafts and gears section, alongside the rest of the starting mechanism.
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The pinion is the small gear that rides on the mainshaft and engages with the kickstart quadrant when you swing the lever down. It's the piece that actually transmits that kick into turning the gearbox mainshaft to fire the engine over. Because it's engaging and disengaging every time the kickstart is used, it takes wear on the teeth over the years, and a worn pinion is a common cause of a kickstart that slips or won't hold engagement.
Our catalog record spans a long run of appearances across 650 and 750 twins, so this part has been used for a long stretch of production. If you're chasing a kickstart that clunks, slips, or doesn't catch reliably, this pinion and the mating quadrant and ratchet parts are the first place to look.
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