| Also known as | 68-734 |
| Diagram | Fig. 4 — CRANKSHAFT · ref 15 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1970 |
BSA Crankshaft only
A crankshaft (PN 68-0734), the rotating shaft that turns piston motion into rotary drive.
This is a crankshaft, listed in the catalog under the CRANKSHAFT figure. The part number also shows up in an alternate form, 68-734, referring to the same physical component. As the crank, it's the rotating shaft that the connecting rod(s) drive, converting the up-and-down motion of the piston into rotary motion that ultimately turns the gearbox and rear wheel.
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The catalog appearances we have on file run from 1969 into 1970, which tells you the years this part number turns up in the parts books, but it doesn't spell out an exact model. Given the sparseness of the record, confirm fitment against your engine before ordering rather than assuming based on the year range alone.
A crankshaft is a big-ticket, precision part — it's line-bored and balanced to work with a specific set of rods, pistons, and cases, so if you're sourcing a replacement it's worth checking your existing crank's dimensions and journal condition against whatever you're buying, since a mismatch here isn't a simple fix.
We've never carried this one. Tell us what you're after and we'll go looking — you'll get a price and photos before you commit to anything.
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