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Offline Z900GERM

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Clutch slip after heavier clutch spring install
on: September 04, 2021, 06:37:51 PM
Hello I installed Brock's clutch spring upgrade and have noticed some clutch slip. Could I have done something wrong during the install to cause this or has my time come for a new clutch? When I did the spring install the clutch was clean and free of foreign material. I have an ecu flash and full exhaust so I have a little more stress on the clutch when I crack the throttle open.

Offline Z900GERM

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Re: Clutch slip after heavier clutch spring install
Reply #1 on: September 04, 2021, 06:38:48 PM
11k miles

Offline rcannon409

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Re: Clutch slip after heavier clutch spring install
Reply #2 on: September 04, 2021, 09:48:22 PM
If your clutch islipping, a switch to heavier springs isnt going to be a permanent fix.  It never has been, but this is especially true with this assist slipper" type configuration. The old clutches needed spring pressure to lock.   In this design, stiff springs have more to do with how the clutch feels when you pull it.  The stronger spring helps very little.

Power running through this clutch tightens it.  Notice how the ramps do this.  Spring pressure doesnt do much.

I would replace the fiber plates with new, OEM plates.   Pay attention to stack height .  If this is wrong, the clutch wont work properly.

Stock plates can last forever, but once they slip, you are on borrowed time.  I'm not saying you caused this, but often times owners ruin the plates from improper clutch lever play adjustments.  Aftermarket levers can be a problem, too.

This is an old video.  Star Motorcycles was the first to use the design, but now almost everyone has it.  Most every motorcycle clutch is  built by a company called "FCC Japan". 

Last Edit: September 04, 2021, 09:49:31 PM by rcannon409

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Re: Clutch slip after heavier clutch spring install
Reply #3 on: September 04, 2021, 11:01:06 PM
Are you saying you did not have any slip before Brock springs?

If yes, I would re-check your install. If your soft & hard parts suffered from heat or slipping, not much is going to bring it back except new soft/hard parts.

At this point, I would remove the clutch stack and inspect for smearing, burnt or warped parts.

This is what mine looked like at 36K: (it was not slipping)
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Offline Z900GERM

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Re: Clutch slip after heavier clutch spring install
Reply #4 on: September 04, 2021, 11:45:58 PM
Thanks for the answers. It started slipping 2 rides after install of new springs. Going to inspect clutch pack. What should I look for?

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Re: Clutch slip after heavier clutch spring install
Reply #5 on: September 05, 2021, 12:40:44 AM
*Originally Posted by Z900GERM [+]
What should I look for?
Re-read my 3rd sentence.
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Offline rcannon409

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Re: Clutch slip after heavier clutch spring install
Reply #6 on: September 05, 2021, 07:59:02 PM
You will probably see dark spots.  Maybe even missing material.  If its slipped much, you will see it.


Offline Cazzy_R

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Re: Clutch slip after heavier clutch spring install
Reply #7 on: September 05, 2021, 08:35:10 PM
 OP.
 Am I reading this right?  :027:
 You didn't have clutch slip before fitting Brocks springs?
Tighten it 'til it strips then back it off half a turn.

Offline zed9

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Re: Clutch slip after heavier clutch spring install
Reply #8 on: September 06, 2021, 01:47:48 AM
All of those parts are directional as well. There's a sharp and rounded edge on each piece. Also there's cork plates that need to go in a specific order.

Offline Z900GERM

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Re: Clutch slip after heavier clutch spring install
Reply #9 on: September 07, 2021, 05:37:20 PM
I did not have the clutch slip before install. However it didn't start until 3 rides after. I don't believe it had anything to do with it.