![](https://motoinstruction.ru/img/aprilia/17/123034.jpg)
Remove the bowl tappets and the adjustment shims using a magnet.
![](https://motoinstruction.ru/img/aprilia/17/123035.jpg)
Compress the valve springs with the specific tightening bow and with the spring compressing tool.
Specific tooling:
- AP8140179: Valve spring compressor
- 020721Y: Adaptor for valve removal
![](https://motoinstruction.ru/img/aprilia/17/123036.jpg)
Remove the cotters using a magnet.
![](https://motoinstruction.ru/img/aprilia/17/123037.jpg)
Release the valve springs.
Remove the valve spring fittings plus the springs.
![](https://motoinstruction.ru/img/aprilia/17/123038.jpg)
Remove the valves.
![](https://motoinstruction.ru/img/aprilia/17/123039.jpg)