| Diagram | Fig. 3 — CRANKCASE · ref 36 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1970 |
BSA DS ROLLER BEARING B44 - NSK JAPAN
Drive-side crankcase roller bearing for the BSA B44, made by NSK Japan.
This is a drive-side roller bearing for the B44 crankcase, made by NSK in Japan. It shows up in the crankcase section of the parts book, which puts it right where the crankshaft's drive-side journal rides in the case.
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The description ties this specifically to the B44, which is a BSA model, not a Triumph, so don't cross this into a Triumph crank job by mistake. The catalog also carries it under an alternate store reference, NF305, which is worth having in hand if you're ordering from a bearing supplier rather than a parts book.
If you're rebuilding a B44 bottom end this is the kind of part you replace as a matter of course rather than waiting for it to show obvious wear, given what it does holding the crank in position. Call the shop and we'll confirm fitment against your specific case before you order.
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