Clamping spring D.47 Exhaust valve rubber Rotax Max (10) (9)

Despite its simple appearance, this spring has strict technical characteristics (70 mm in diameter, 1.7 mm high and 0.3 mm thick) To meet the engine requirements Rotax Max:

1. Hermetic compression: Its function is to tackle the lip of the membrane against the body of the valve. With a thickness of 0.3 mmIt offers the flexibility to be mounted without a sharp tool while exerting a constant tension to prevent pressure leaks.

2. Pneumatic pressure management: The valve system Rotax Works by pressure difference. This spring allows the membrane to form a waterproof chamber. If the spring is relaxed, the pressure escapes, preventing the guillotine from rising to 7,500 rpm.

3. Thermal resistance: Made in high quality spring steel, it retains its elastic properties despite the intense heat released by the exhaust block located in the immediate vicinity.

💡 Michel's trick

"Do not be done by the size, this 70 mm spring is ultra-precise! If it is distorted, even slightly, it will no longer appear the membrane in a homogeneous way. My advice of old briscard: when you remove it for cleaning, do not stumble it Not like a savage. If it does not slap 'more good when you put it back in place, it is dead. A spring with 2 balls can make you lose 10 km / h in a straight line if the valve opens badly!"

🎓 Tuto: installation and control

1. Visual inspection: Before mounting, put the spring flat on a straight surface. If it is veiled (if it does not touch anywhere), replace it. Its dimensions of 1.7 x 0.3 mm Do not tolerate any deformation.

2. Cleaning the throat: Before positioning the spring, pass a clean cloth with brake cleaner in the valve body groove. The membrane must adhere perfectly to the metal.

3. Setting up: Slide the spring gradually around the membrane. Make sure it is well centered and does not plus orange rubber.

4. Test of rotation: Once the spring is in place, the membrane should no longer be able to move or turn freely. This is the sign that the seal is optimal.