Exhaust valve piston support spring Rotax Max

E Spring is the true "programmer" mechanical of your acceleration:

1. Controlling the opening threshold: The spring is opposed to pneumatic pressure. By adjusting its voltage (via the black wheel), you determine if the valve must open early (for more extension) or later (to keep the torque at the turn output).

2. Recall of guillotine: As soon as you release the accelerator and the pressure drops, it is this spring that instantly pushes the guillotine down. Without a spring in perfect condition, the valve would remain blocked at the top, making the engine hollow and impossible to restart at low speed.

3. BALANCE OF PERFORMANCE: Its stiffness is calibrated precisely by Rotax To provide a fluid transition between the low-speed circuit and the total opening of the exhaust, thus avoiding the brutal jerks.

💡 Michel's trick

"Listen well: This spring is your imaginary gearbox! If it is packed or rusty by moisture, it becomes softer and your valve opens anytime. My advice: Change it at least once a season. And small trick track: if you ride on A very sinuous circuit, screw your adjustment knob to compress a little more this spring; it will prevent the valve on the bumps!"

🎓 TUTO: Setting and maintenance

1. Positioning: Place the spring well vertically in the bowl of the valve piston. Make sure it does not cling to plastic edges when closing the lid.

2. The basic setting: Screw the black wheel thoroughly, then unscrew it about 12 to 14 clicks. This is the standard setting for a Rotax Max.

3. Elasticity control: Compare from time to time your used spring with a new one. If there is shorter than 2-3 mm, it's "tackled" and no longer doing his job properly.

4. Prevention: When cleaning, spend a small gig shot (WD40 Or engine oil) on the spring to prevent condensation from creates rust, which could cause it to be broken.