Rotax exhaust valve stud - 6 x 30.5 x 12 mm Guarantee the fluid movement of your valve with this original stud Rotax. With its precise dimensions of 6x30,5x12 mm, it ensures a perfect guidance of the guillotine, avoiding any blocking and optimizing the performance of your engine to all the regimes.

The exhaust guillotine Rotax Max is a mobile pneumatic valve that varies the height of the exhaust light. It allows to get a "full" engine at low speed while freeing all the power (about 7,500 rpm) when the valve opens. It is a critical piece that requires irreproachable cleanliness to avoid "holes" with acceleration.

The Guillotine body (n ° 7) is the fixed part that screws on the cylinder and in which the movable guillotine slides. It is it that ensures the maintenance of the entire valve system (bellows, spring, cap). If this part is dirty or distorted, the valve can no longer rise and descend freely, which brides the engine performance.

Rotax Screw BTR M6x16mm

The Circular membrane spring (70 x 1.7 x 0.3 mm) is the metal voltage ring that ensures the maintenance and tightness of the orange bellows base on the valve body. Its precise dimensions ensure a uniform pressure on the entire circumference of the membrane, condition sine qua non to the proper functioning of the pneumatic system.

idem for Evo

spare parts origin

 Rotax Circular spring of membrane 134x3,0x0.65mm