The copper washer is important for proper oil sealing at the primary cover nuts and oilway passage.
This copper washer is 5/16″ ID. Made in the UK. Fitment for 650 and 750 Triumphs from 1963-1982.
The washer is specifically used under the domed primary cover nuts and under the oil passageway bolt. The washer can be used in place of a 5/16 fiber washer for oil-sealing purposes.Â
