Maintaining your DVO Topaz MX [paid link] rear shock is crucial for ensuring a smooth ride and maintaining optimal performance. One of the most important tasks in maintaining the Topaz MX [paid link] is performing an oil change. Regular oil changes help prevent wear, reduce friction, and maintain consistent damping performance. This guide will walk you through the process of changing the oil in your Topaz MX rear shock.

Tools Required

• 8mm Allen wrench [paid link]
• 3mm Allen wrench [paid link]
• Torque wrench [paid link]
• DVO oil (specific to Topaz MX)
• Shock pump
• Clean rag or towel
• Compression piston tool (optional)
• 10mm socket wrench or spanner (depending on the model)
• A clean workspace with a flat surface

Preparing for the Oil Change

Before starting the oil change, make sure you have all the necessary tools and that your workspace is clean and organized. It’s also crucial that you have the right type of oil that is recommended for the Topaz MX model. Refer to the manufacturer’s guide for the precise oil specifications to ensure you get the best performance.

1. Remove the Shock from the Bike
   Start by removing the rear shock from the bike. This step involves detaching the shock from the frame using the appropriate tools. Most rear shocks can be removed by simply unbolting them with a 10mm socket or spanner. Ensure the bike is securely positioned while you do this.
2. Inspect the Shock
   Once the shock is off the bike, take a moment to inspect it for any visible signs of wear or damage. Check for any oil leakage or unusual sounds when you compress the shock. This step helps ensure that there are no underlying issues before proceeding with the oil change.

Draining the Old Oil

To replace the oil in the Topaz MX, it is crucial to drain the old oil properly. This will ensure that there is no contamination or mixing of old oil with the new oil, which could affect performance.

1. Place the Shock in a Stable Position
   Place the shock in a secure, stable position on a clean surface. It’s a good idea to lay down a clean rag or towel underneath the shock to catch any residual oil that might spill during the draining process.
2. Loosen the Compression Damping
   Using a 3mm Allen wrench, loosen the compression damping screw to relieve the pressure from the shock. This step will allow the oil to flow more easily from the shock.
3. Remove the Air Valve Cap
   Use the appropriate tool to remove the air valve cap. This step will allow you to depressurize the shock and fully drain the internal oil without any resistance.
4. Drain the Oil
   Carefully unscrew the damper body of the shock, being cautious of any remaining oil. Once removed, pour out the old oil into a container. If you see any signs of contamination or debris in the oil, clean the shock’s internals thoroughly before proceeding.

Rebuilding and Refilling the Shock

Now that the old oil has been drained, it’s time to rebuild the shock and refill it with fresh oil. Proper refilling is critical for the shock’s performance and longevity.

1. Clean the Internals
   Using a clean rag, carefully wipe down the inside of the shock body to remove any debris or old oil. Pay special attention to the compression damper and any moving parts to ensure there is no buildup that could interfere with performance.
2. Install the New Oil
   Using the DVO-specific shock oil, begin to carefully refill the shock. Pour the recommended amount of oil into the damper body, ensuring that it reaches the correct level according to the manufacturer’s guidelines. Be careful not to overfill.
3. Reassemble the Shock
   After adding the oil, carefully screw the damper body back together, making sure all seals are properly aligned to avoid any leaks. Tighten all bolts securely using a torque wrench [paid link], following the specified torque settings found in the DVO manual.
4. Check for Leaks
   Once the shock is reassembled, check for any signs of oil leakage around the seals or the air valve. Leaks can significantly affect performance, so it’s essential to ensure the shock is sealed properly.

Setting the Correct Air Pressure

Setting the correct air pressure in your rear shock is crucial for achieving the ideal ride characteristics. Too much air pressure can result in a stiff ride, while too little can cause bottoming out.

1. Set the Sag
   Before setting the air pressure, measure the sag, which is the amount the shock compresses under your weight. DVO typically recommends a sag between 25% and 30% of the shock’s total stroke. To adjust the sag, use the shock pump to add or release air until the desired sag is achieved.
2. Fine-tune the Compression Settings
   After setting the air pressure, fine-tune the compression settings for optimal damping. Adjust the low-speed and high-speed compression knobs according to your riding style and terrain preference.

Troubleshooting Common Issues

Even after an oil change, you might experience some issues with your Topaz MX rear shock. Here are some common problems and how to troubleshoot them:

• Lack of Rebound or Excessive Rebound: This may indicate incorrect oil levels or that the rebound setting needs adjustment. Ensure the oil is at the correct level and adjust the rebound knob accordingly.
• Leaking Oil: If you notice oil leakage, check all seals and O-rings. Make sure that the damper body is properly tightened and that the seals are in good condition.
• Poor Damping Performance: If the shock feels excessively stiff or soft, double-check the oil level and air pressure. Recheck your compression and rebound settings to make sure they are correctly set for your riding conditions.

Conclusion

Performing an oil change on the DVO Topaz MX rear shock is a vital maintenance task that helps ensure optimal performance and longevity. By following the step-by-step process outlined above, you can maintain your shock’s performance and avoid costly repairs. Regular oil changes, proper air pressure settings, and occasional inspection are all essential to keep your rear shock working smoothly for years to come.