| Also known as | E6347, M70-6347 |
| Diagram | Fig. 2 — CRANKCASE · ref 38 |
| Subsystem | engine bottom |
| Listed in parts books | 1967–1968, 1970 |
DRAIN PLUG 18 SHORT 66-70 - (For Long use 70-4922)
Short-pattern primary chaincase drain plug for mid-to-late 1960s unit twins, catalog number 70-6347.
This is the short-pattern drain plug used in the primary chaincase, catalog number 70-6347, appearing in the CHAINCASE AND CHAINS and CRANKCASE figures across the mid-to-late 1960s catalog listings. It also carries the older E6347 alias, which is the legacy letter-prefix form of the same part.
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The plug seats in the primary chaincase and doubles as the point of access for checking or draining the primary oil bath. The catalog specifically calls this out as the "short" version - if your bike calls for the long pattern instead, the parts book points you to 70-4922, so it pays to know which one your case takes before you order.
We carry this under 70-6347 and it also shows up in some records as M70-6347. If you're not sure whether your primary case wants the short or long plug, bring in the old one or give us a call before ordering - swapping in the wrong length is an easy mistake to avoid.
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