| Listed in parts books | Not catalogued by year yet |
LAYSHAFT ASSY 1969-71 650
Gearbox layshaft assembly for 1969-71 650 Triumph twins, part 57-4155.
This is the layshaft assembly for the gearbox, listed in the parts books for the 650 twins across 1969-71. The layshaft sits inside the gearbox and carries the gear pinions that mesh with the mainshaft gears, so it's a core piece of the internal gear cluster rather than something you'd swap on a whim.
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Because it's an assembly, ordering this gets you the shaft with its associated gears rather than a single loose part. If you're rebuilding a box from that era, this is the piece that everything else in the cluster times off of.
Give us a call if you're not sure which spline count or gear cluster your box uses before you order — gearbox internals changed enough over the years that it pays to confirm before you commit.
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