Clutch Cushion Kit - Clutches don't last long?

With the Brock’s Performance Hayabusa Clutch Cushion Kit installed correctly, you should see increased clutch life, better launches, and more MPH thanks to the added 550 lbs. of static pressure. If your clutches are wearing out prematurely, something is likely assembled incorrectly, worn, or broken.

Here are the most common causes—ranked in order of likelihood:

1. Notched Inner Clutch Hub (Most Common)

• Steel plates eventually wear grooves (notches) into the aluminum inner hub splines during repeated launches.

• These notches prevent the plates from sliding freely, leading to binding, incomplete clutch engagement, and excessive heat.

• Solution: Inspect and replace the inner hub as needed. In high-power drag applications, it's common to replace this part multiple times per season.

2. Incorrect Oil

• Dead-stop launches can generate clutch temps exceeding 750°F. Most organic oils can’t handle this.

• Solution: Use 100% fully synthetic motor oil only—we recommend Alisyn Aerospace oil and Petron oil additive, both available in our store.

3. Clutch Drag or Creep

• If your bike pulls forward with the clutch pulled in, excessive heat builds up and destroys the clutch quickly.

• Common causes:

  • Cracked sprocket cover

  • Worn or expanding hydraulic clutch line

  • Improper stack height or worn components

• Solution: Fix mechanical issues and replace the stock line with a braided steel line. 

4. Worn Backing Plate Springs (Outer Hub)

• Weak or worn outer clutch hub springs can cause uneven pressure and early wear.

• Solution: Inspect and replace backing plate springs as needed. Refer to our CCK installation instructions and video.

5. Gearing Issues

• Running tall or stock gearing in a drag racing environment places extra strain on the clutch.

• Solution: Use appropriate gearing for your launch RPM and power level. Lower gearing = less stress on the clutch.

6. Rider Technique

• Holding the clutch too long instead of letting it out quickly generates massive heat and early failure.

• Red flag: If the clutch drags or feels spongy in the shutdown area, it’s likely overheated from excessive slipping.

• Solution: With the right setup, the clutch should be fully released midway through first gear or earlier.

7. Clutch Slave Cylinder Issues

• If the slave cylinder is binding or sticking (often due to dirt or chain lube buildup), it can prevent full clutch engagement.

• Symptoms: Cracked pressure plate, pressure plate won’t install easily, extremely stiff lever feel.

• Solution: Clean, rebuild, or replace the slave cylinder as needed.

Next Steps:

• Refer to our Hayabusa Clutch Cushion Kit Installation Instructions for detailed assembly guidance.

• Watch our Clutch Inspection Video (filmed on a ZX-14R but applicable to most performance bikes) for visual diagnostics and tips.

If you need further assistance, our tech support team is ready to help you get your setup right.