Note. The operations described below refer to removing only one head but apply to both heads.
Remove the head cylinder unit.
Undo and remove the screw on the inlet side.
![](https://motoinstruction.ru/img/aprilia/17/123028.jpg)
Undo and remove the screws on the outlet side.
![](https://motoinstruction.ru/img/aprilia/17/123029.jpg)
Separate the cylinder from the head.
Collect the washer.
![](https://motoinstruction.ru/img/aprilia/17/123030.jpg)
See also specifications for this operation.