The early unit-construction Triumph 650 models were fitted with an extended shaft plug in the primary chaincase to allow access to the primary chain adjuster. This plug also serves as a drain plug and is sealed with a fiber washer. Where a shorter plug is preferred for easier access, the 70-6347 drain plug is interchangeable in most cases.
This flanged drain plug features a corrosion-resistant zinc finish and a small hex head. Threads are 7/16″-18 TPI BSF, with an overall length of approximately 1-7/16″. Made in the UK.
The plug must be removed to drain the primary chaincase of it’s oil prior to performing primary chain adjustments or clutch service. A fiber washer is used under the flanged head of the plug to seal the plug against the chaincase.
On some models, the left-hand side of the exhaust system must be loosened or removed to access the hex head of the plug with a spanner or socket. It may also be necessary on the 1963 models to loosen the left footrest enough to allow it to drop down and provide unobstructed access for the spanner or socket and ratchet combination. Some owners modify the plug with a slot cut across the hex head, allowing the use of a flat-blade screwdriver tool for reinstallation of the plug prior to fully tightening.
This is the shorter plug; we also stock the longer version which is correct for Pre 1967 650 twins PN# 70-6347.
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