| Diagram | Fig. 2 — CYLINDER AND CRANKSHAFT · ref 25 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1970 |
BSA Big-end bush, connecting rod
Big-end bush for the connecting rod, the bearing surface between the rod and crankpin.
This is a big-end bush for the connecting rod, the bearing surface that lets the rod's big end run on the crankpin. It shows up in the catalog under the CYLINDER AND CRANKSHAFT figure, which places it down in the bottom end of the engine where the rod meets the crank.
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Our records show this one across catalog appearances from 1969 through 1970, but the entries are brief and don't spell out a specific model. If you're rebuilding a bottom end and matching part numbers off your parts book, this is worth confirming against your actual engine before ordering.
A big-end bush is a wear item - it's what actually takes the beating every time the piston goes up and down, so if you're pulling the rod for inspection this is one of the first things to check for play or scoring.
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