| Also known as | E5866 |
| Diagram | Fig. 15 — EXHAUST PIPES AND SILENCERS (See also Page 46) · ref 14 |
| Subsystem | exhaust |
| Listed in parts books | 1967–1968, 1970 |
Silencer (muffler)
Exhaust muffler (silencer) for Triumph TR6R and T120R exhaust systems, cataloged as 70-5866 (also E5866).
This is the muffler that fits on the exhaust pipe for the TR6R and T120R models, sometimes called a silencer in the older parts-book language. The catalog shows it under 70-5866, with the older-style alias E5866 also on file for the same part. It shows up across exhaust-pipes-and-silencers figures in the parts books, so it's a standard fitment component on those model lines rather than something one-off.
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A muffler like this bolts to the rear of the header pipe and quiets the exhaust note while helping the engine breathe correctly at the tailpipe end. On these bikes they're typically run as a matched pair, one per side, though the exact side-specific fitment isn't something we can confirm from the catalog record alone.
If you're chasing this part number down for a rebuild, check your parts book against both 70-5866 and E5866 since either one may show up depending on which edition you're working from. Give us a call if you want to nail down exact fitment before you order.
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