• Addresses: Chattering under high rpm / hard drag starts.
• App: 4BH YZF750,  2GH FZR1000, YZF1000 and similar apps.
• Background: The clutch "chatters" under high rpm / high slippage / high power conditions.
• The damping springs on the primary gear bottom out and transfer undamped force to the clutch.
• If the chattering is allowed to continue, the clutch hub, "outer" will shatter and the clutch hub, "inner" will become extremely grooved.
• WARNING!!!! USE AT OWN RISK!!! REQUIRES MODIFICATION ON PARTS THAT MAY FAIL  -  POTENTIALLY EXTREMELY DANGEROUS!!!!

• 
  

• 1. Grind shallow groove to capture oil and channel it through the backing plate to the inside of the clutch hub, inner as on left side. It's about .080" deep at the transfer hole. Do all 6 transfer holes. Right side blue hole is stock configuration for reference.
   

• 2. Add 3 holes, 1 at each location as marked in the blue dot on right. Use the same spacing and hole size as existing holes on left. (Note: some hubs have the holes on the peak of the spline and some on the valley of the spline - just duplicate existing style)
• 3. You will end up with a matched series of holes that are offset towards the rear of the clutch hub (towards the engine).
• 4. These additional holes will allow oil to reach the inner clutch plates and help keep them from chattering.
• 5. This mod does NOT work for FZR600!!!


Remember! These are hints only. You are responsible for whatever you do with this information.

If you use this information and it helps your application, please contact Factory Pro with results. Thanks, Marc

Additional Links

http://homepages.paradise.net.nz/lpgb/mainmc/clutch/clutch.htm

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