| Also known as | H4011 |
| Diagram | Fig. 20 — TELESCOPIC FRONT FORK · ref 20 |
| Subsystem | forks front |
| Listed in parts books | 1971–1972, 1974, 1976–1980, 1983 |
| Also fits (as replacement) | 1971 · for 97-4087 |
FORK SPRING T120/T140 OIL IN FRAME 19IN
Fork spring for oil-in-frame Triumph T120/T140 forks with 19-inch tubes, fits inside each fork tube to support and control the front end.
This is the fork spring for the oil-in-frame Triumph front end, listed for the T120 and T140 with the 19-inch fork tubes. It sits inside each fork tube, one spring per leg, and does the actual work of supporting the front of the bike and controlling how the forks compress and rebound over bumps. On oil-in-frame Triumphs the front frame tubes double as the oil reservoir for the engine, so the fork internals in these years look a bit different from the earlier pre-unit and early unit forks, and the spring rate and length are matched to that setup.
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The part number carries forward from an older factory number, 97-4087, so if your parts book or an older invoice shows that number, it is the same physical spring under the current numbering.
Fork springs sag and go soft with age and mileage, and a worn set will let the front end dive under braking and sit lower than it should at rest. If you're rebuilding a set of oil-in-frame forks, it's worth checking these against a fresh spring for length before you put the old ones back in.
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