![](https://motoinstruction.ru/img/aprilia/17/123099.jpg)
Fit a new gasket between the cylinder and the head.
Couple the cylinder and the head.
![](https://motoinstruction.ru/img/aprilia/17/123100.jpg)
Screw without tightening the two screws on the outlet side.
![](https://motoinstruction.ru/img/aprilia/17/123101.jpg)
Screw without tightening the screw on the intake side.
Tighten the cylinder-head fixing screws to the prescribed torque.
Place the cylinder-head unit on the crankcase stud bolts.
![](https://motoinstruction.ru/img/aprilia/17/123102.jpg)