| Also known as | BES 610, BES-610 |
| Diagram | Fig. 19 — EXHAUST PIPES AND MUFFLERS, TR7RV, T140V · ref 19 |
| Subsystem | exhaust |
| Listed in parts books | 1974, 1976–1980, 1983 |
| Also fits (as replacement) | 1974 · for 71-3999 |
MUFFLER SET,T140/T150 1973-82 TJ WASSELL UK
Muffler set for T140/T150 Triumphs, catalogued 1973-82, factory number 71-4159 (supersedes 71-3999).
71-4159 is a muffler set for the T140 and T150 Triumphs, catalogued for the 1973-82 span and listed as TJ Wassell UK made pieces. This is sold as a set covering both silencers, mounted at the rear of the exhaust system where the header pipes terminate. It's the modern factory-catalog number for a part that was previously listed as 71-3999, so if your parts book or an older invoice shows that number, it's the same physical item.
Read more
These mufflers do the job every silencer does on a Triumph twin or triple: quiet the exhaust note and provide backpressure the engine's tuned around. Because they're sold as a set, expect to order and fit both sides together rather than piecing in a single muffler.
Our catalog record ties this to the T140 and T150 lines across the mid-to-late 1970s into the early '80s, but if you're not sure which muffler style your bike left the factory with, or whether there were mid-run changes to shape or mounting, give us a call before you order and we'll confirm fitment against your bike.
Sorry if we got something wrong here. If you think this information isn't correct, .