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.

Rotax Valve Hood Fixing Spring - Land 17 This high-strength steel spring ensures firm and secure holding of the hood of your exhaust valve. Original room RotaxIt guarantees the pressure necessary for the valve system to operate constantly, thus avoiding the untimely openings or the compression losses.

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.

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 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.

The M8 Stop Washer (N ° 21) is a security technical washer placed between the nut and the cylinder base. Its role is to prevent any inconvenient loosening of the high engine mount nuts. On the DD2 motor, where the vibrations and transmission stresses are important, it is essential to ensure the integrity of the motor block.

The Screw th m8x30mm (n ° 22) is a high-quality hexagonal head screw used to bridge the cylinder on the motor housing of the Rotax Dd2. With its length of 30 mm and its thread M8It ensures a solid grip in the low engine nets. She works in pairs with the stop washer (n ° 21) to ensure that the cylinder remains perfectly motionless despite repeated explosions.

This precision O-ring (dimensions)23,3 x 2,4 mm) is an original partRotax. It ensures the perfect sealing between the well of bougie and your engine's head (buckle cover) Rotax Max. A worn or pinched seal can cause coolant leaks or dirt infiltration into the combustion chamber.

The Cylinder head seal 105 x 2.5 mm is the large peripheral O-ring that ensures the sealing of the cooling circuit between the cylinder and the red cylinder head. Designed according to the strict standards of RotaxIt supports high pressures and extreme thermal variations, ensuring that the cooling liquid remains perfectly confined in its circuit.

The Red cylinder head (ref. Rotax 211225) is the upper structural element that closes the high engine cooling circuit. Real visual signature of engines RotaxThis injected aluminum alloy part is designed to withstand the most intense thermal and vibratory stresses, ensuring the overall waterproofing of the water chamber.

Cylinder head cover Rotax Max not painted