| Also known as | T1177 |
| Diagram | Fig. 8 — GEARBOX SHAFTS AND GEARS · ref 1 |
| Subsystem | gearbox |
| Listed in parts books | 1960–1962, 1967 |
MAINSHAFT C/R 650
Close ratio gearbox mainshaft for 650 twins, part number 57-1177.
57-1177 is a mainshaft for the close ratio gearbox on 650 twins. It's the shaft that carries the gearbox pinions and takes the drive from the clutch through the box, sized for the close ratio internals rather than the standard-ratio setup.
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Our records on this one are thin beyond the basic listing, so if you're not sure whether your box is close ratio or standard ratio, give us a call before ordering. Getting this wrong means a shaft that won't mate up with the gears you've got.
If you're rebuilding a close ratio 650 gearbox, this is a core internal part worth checking closely for wear at the bearing journals and spline before you put the box back together.
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