| Diagram | Fig. 5 — 850 Engine: Crankcases, Filter, Breather, Tachometer Drive · ref 6 |
| Subsystem | engine bottom |
| Listed in parts books | 1975 |
Norton Bearing, Main
Main bearing for the Norton Commando engine crankcase, part number 06-4118.
This is a main bearing for the Norton Commando engine, listed in the crankcase and breather section of the parts book. It's a roller-type bearing that sits in the crankcase supporting the crankshaft, one of the parts that has to hold up to the loads an engine puts on it at that end of the crank.
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Our record for this one is thin, just a single catalog listing tying it to the Commando engine's bottom end. Other catalogs we've seen call it a Superblend roller main bearing, which is a term Norton people will recognize for the upgraded bearing type used in later Commando engines.
Call the shop before you order to confirm which crank position and which engine variant this bearing is meant for. Main bearings on these engines aren't all interchangeable and we want you to get the right one the first time.
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