Slipping Clutch...I'm Stumped!

[Guest sobe919]

I have a '98 Royal Star 1300, 20k miles, lightly driven, no synthetic oil ever used, clutch slips intermittently, replaced clutch spring and fibers, steeles were mint, still slipped, started looking at clutch master cylinder, I flushed and bled the clutch fluid. I ran it hard with no slipping for 15 minutes then it started slipping again, any ideas? I'm stumped guys. Thanks for any input!

[Bvinson]

Just a guess but maybe to much fluid in the master cylinder. If it is over filled as you ride the fluid heats up and expands. This can cause pressure in the line and make the slippage you describe.

[loehring]

I'm assuming you're using some type of motorcycle oil and not automotive. I use synthetic but it's Rotella-T. An automotive oil with anti-wear additives will make the clutch do that.

[KiteSquid]

did you pre-soak the fiber disks in engine oil before installing?

[Guest sobe919]

Using Kawi motorcycle oil. Fibers were pre-soaked with the same oil.

[V7Goose]

In no particular order, but all possible:

• Pressure plate worn or damaged
  
• Clutch assembled wrong
  
• Activating rod bent so not fully retracting
  
• Slave cylinder needs rebuild
  
• steel plates polished
  
• moisture in your brake fluid
  

[Squeeze]

Probably the Expansion Hole on the Bottom of the Mastercylinder is clogged or the Clutch Lever has not enough(or no at all) Freeplay.

[Guest sobe919]

Clutch doesn't slip for the 1st 15 minutes when cold and the clutch has proper freeplay. After 15 min, she starts to slip and has zero freeplay. Clutch lever also gets stiff when the freeplay goes away.

[Squeeze]

What i said, either the Expansion Hole is clogged or no Freeplay on the Lever. You didn't change the Lever to an Aftermarket Part ?