Valvola d'aspirazione- Valvola di scarico 
Yamaha X-Max 250 2011
1.
Valve, Intake
2.
Valve, Exhaust
3.
Seat, Valve Spring
4.
Spring, Valve Inner
5.
Spring, Valve Inner
6.
Spring, Valve Outer
7.
Spring, Valve Outer
8.
Seal, Valve Stem
9.
Retainer, Valve Spring
10.
Cotter, Valve
11.
Arm, Valve Rocker
12.
Shaft, Rocker
13.
Shaft, Rocker
14.
O-Ring
15.
Screw, Valve Adjusting
16.
Nut Hexagon 371121580000
Disegno 87817
