Rotax m8 stop washer (21)

The 64x2mm O-ring is the internal seal located between the dome of the cylinder head and the cylinder. Its precise dimensions (64 mm inner diameter and 2 mm thick) are designed to fit perfectly into the cylinder groove, preventing the cooling liquid from seeping into the combustion chamber.

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.

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

The Cylinder head Rotax MAX / DD2 is the red upper piece that seals the high engine. She is 100% compatible with the entire 125cc range from Rotax, including direct socket motors (MAX) and two-speed engines (Dd2). It ensures the circulation of the coolant around the combustion dome for perfect thermal stability.

TheM8 base nut is the attachment element that engages the cylinder at the bottom motor (housing). On an engine Rotax Max, there are four, positioned at the corners of the base. Their role is to maintain a constant pressure on the base gasket to ensure the sealing and absorb explosion and vibration constraints.

idem for Evo

spare parts origin

The Adjustment screw, located at the top of the valve hood, is the direct interface between the driver and the engine. By screwing it or by unscrewing it, the preload of the internal spring is modified, which defines which precise regime will open to release all the power of the Rotax.

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.