| Diagram | Fig. 5 — 850 Engine: Crankcases, Filter, Breather, Tachometer Drive · ref 14 |
| Subsystem | engine bottom |
| Listed in parts books | 1975 |
Norton Nut
A nut listed in the crankcase and breather section of the engine, cataloged for 1975 with limited detail on file.
This is a nut, PN 06-3825, showing up in the crankcase, filter, breather, and tachometer drive area of the engine per our catalog record. Our only catalog appearance for it is a single 1975 listing, and the description itself is just "Nut" with no further detail spelled out.
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One catalog reference we've seen elsewhere calls it a tall 5/16-inch cylinder base nut, which lines up with the crankcase-area figure grouping we have on file. Given how thin our own record is on this one, it's worth confirming against the actual hardware before you order.
If you're trying to match this to your engine, bring the old nut in or give us a call and we'll work through fitment together before it ships.
Sorry if we got something wrong here. If you think this information isn't correct, .