| Also known as | E3994 |
| Diagram | Fig. 11 — ENGINE FITTINGS AND EXHAUST SYSTEM · ref 23 |
| Subsystem | exhaust |
| Listed in parts books | 1964–1967 |
Right exhaust pipe
Right-hand exhaust pipe, part number 70-3994 (also listed as E3994), from the engine fittings and exhaust system section.
70-3994 is the right-hand exhaust pipe, listed in the engine fittings and exhaust system section of the parts books across 1964 through 1967. It's also known under the earlier E3994 designation, which is the number you'd find in older parts books before the numbering was updated.
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This pipe runs from the exhaust port on the right side of the cylinder head back to the silencer, carrying spent gases away from the engine. Being the right-side pipe, it's not interchangeable with the left-hand pipe - the two are shaped and routed differently to clear the frame and other components on their respective sides.
If you're sourcing one of these, have your parts book or the part number handy so we can confirm it matches what's called for on your machine. Exhaust pipes can look similar side to side but the bends and mounting points are specific to which side they're for.
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