The 1966-1968 unit-construction Triumph 650 models were fitted with a short 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 an extended plug is preferred, the 70-4922 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 3/4″. 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/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.
The product images shown are for illustrative purposes only and may not be an exact representation of the product received. Manufacturers occasionally make minor cosmetic changes to items, such as color, finish, label, or design. These changes do not impact the item’s function or compatibility. Please contact us if you have specific concerns regarding appearance.
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