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O-ring that fits the cilinderhead sidecovers. You need 4.
Repalcing these O rings prevents or repairs leakage from the rocker axls.
These O rings are VITON rubber. VITON can handle a higher temperature than NBR, which can stand around 100 degrees C. VITON can handle around the double.MIND: These O rings have a Shore factor of 80, instead of the standard 70. So they may be a bit stiffer that you might expect..