| Also known as | E8780 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 31 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1974 |
Roller bearing, steel cage
A steel-cage roller bearing used as a crankshaft main bearing in the engine bottom end.
70-8780 is a roller bearing with a steel cage, one of the crankshaft main bearings used in the bottom end of the engine. It shows up across the CRANKSHAFT AND CONNECTING RODS and CRANKCASE figures in the parts books, which is where you'd expect a main bearing to live - supporting the crank as it spins inside the cases.
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The older parts book form of this number is E8780, so if you're working from an early manual or a box of parts pulled off a bike years ago, that's the same physical bearing under a different label.
Our catalog record doesn't spell out which specific model this bearing was fitted to across its run, only that it appears repeatedly in bottom-end figures from the late '60s into the mid '70s. If you're rebuilding a bottom end and need to confirm this is the right bearing for your crankshaft, call the shop and we'll go over your specific engine before you order.
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