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.

Original part Rotax

Theguillotine O-ring 6 x 2,5 mm Rotaxis an original manufacturer part for the engine exhaust valve system (guillotine) Rotax Two times.

It ensures perfect sealing of the valve mechanism and ensures optimal operation of the exhaust opening system.

The exhaust valve gasket is an essential part guaranteeing the perfect sealing of the valve system on the rotax motors. It ensures optimal operation of the exhaust valve and preserves motor performance.

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.

spare parts origin

idem for Evo

spare parts origin

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

The Support spring is housed between the valve piston and the black adjustment cap. Its role is to exercise a constant reminder force on the guillotine to keep it in the low position. It is the resistance of this spring that defines when (which engine speed) the pressure of the gases will be able to lift the valve to release the power.