| Diagram | Fig. 16 — FRAME · ref 27 |
| Subsystem | frame |
| Listed in parts books | 1974, 1976–1978 |
Crankcase breather pipe - rear
D-section rear crankcase breather hose for oil-in-frame Triumph twins, 1974-78 catalog listings.
This is the rear crankcase breather hose, the D-section rubber tube that carries engine breather gases out from the crankcase and routes them along the rear fender area. It's a simple but necessary part on the oil-in-frame Triumph twins, since a cracked or perished breather hose can leak oil mist or let the crankcase pressurize wrong.
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Our catalog record ties this one to the FRAME figure and shows it appearing across 1974 to 1978 listings, which lines up with the oil-in-frame 750 twins of that era. If your parts book lists this under a different length or a companion hose number, check that you're ordering the right one for your setup.
Rubber parts like this age out even when they look intact on the outside, so if yours has been on the bike a long time it's worth a look for cracking or softening at the fittings before you put the bike back together.
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