| Diagram | Fig. 31 — HANDLEBARS AND CONTROL LEVERS · ref 24 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1973, 1976–1980, 1983 |
Nut - breather tower to air box
Nyloc nut, 1/4 UNF, that secures the breather tower to the air box on Triumph unit twins.
This is the small nut that secures the breather tower to the air box, part number 14-1901. It's a nyloc nut, which means it carries its own locking insert instead of relying on a lock washer, so it holds tension in a spot that sees engine vibration all day long.
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The catalog shows this nut turning up across a wide range of figures - crankcase, oil and breather pipes, primary transmission, oil pump and gearbox sprocket areas, even outer primary cover and handlebar control listings. That spread just reflects how many assemblies use a 1/4 UNF nyloc nut rather than telling you anything special about this exact application beyond the breather tower to air box joint named in the description.
It's a small, inexpensive item to lose track of, but it's the kind of fastener that's worth keeping fresh rather than reusing once the nylon locking ring has been worked loose a few times. Call the shop if you want to confirm it's the right nut for your particular breather setup before you order.
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