Author Clutch upgrade  (Read 1288 times)

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  • Offline Sarge   us

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    Offline Sarge

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    Clutch upgrade
    on: Aug 02, 2022, 11.34 pm
    Aug 02, 2022, 11.34 pm
    Good day, all.

    Iíve had my Z900 since 2017 and it has 15,000 miles on the clock.  I have experienced clutch slippage here and there with hard riding in north Georgia, the Dragon, Cherohala, Moonshiner, etc. under hard acceleration, mostly in 3-5, and high speed in 6th.  It has recently become more frequent.  I corrected the lack of clutch cable free play the day I purchased the bike.  Iíve always felt like the actuator arm return spring is not strong enough, but Iíve manually pushed the clutch lever out to the stop while riding hard and it had no affect when slipping was occurring.  I might fabricate a small piece of aluminum to JB weld to the actuator arm to preload the spring about 3mm to correct that.  Iíve recently been considering selling the bike, but honestly, the Zed has been one of my favorite bikes in 32 years, even next to my RZ350.  So, Iíve decided to keep her and installing an SC Project full Ti system, PAIR block off, filter, ECU flash by 2WheelDynoWorks (they told me they have a flash specifically for this setup), and I have the Brockís HD clutch springs.  Iím sure that will breed more excitement out of her.

    Iím going to inspect the clutch and evaluate the condition of the friction/drive plates and refurbish the clutch (if required) and installl the springs for now and perform the rest of the upgrades and check sync of the throttle bodies once winter sets in, as Iím currently restoring an 85 Yamaha Maxim 700 and want to get it completed.

    That having been said, I want some feedback on which friction and/or drive plates I should use if they are worn out of spec (drive plates blued, etc,)?  If Iím using the Brockís springs, are 2017 OEM clutch components sufficient?

    Thanks in advance.

    Sarge
    Craig

  • Offline RobZ900   gb

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    Offline RobZ900

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    Re: Clutch upgrade
    Reply #1 on: Aug 03, 2022, 12.03 am
    Aug 03, 2022, 12.03 am
    Recently fitted the heavier springs from Barnett to my 2017 in anticipation of having the ECU flashed (done now). The feel at the lever is marginally heavier, but only to the extent that you can feel thereís a difference but without making the clutch pull any harder work. I only wish Iíd done the clutch springs sooner as it feels like the gears are engaging better since the spring change. As for the actuator, recently saw a kit for a different bike where they fitted a spring between the actuator and the casting where the adjustment nuts go to help with the return. Perhaps something to consider if you feel the need, but honestly Iíd just try the clutch springs first and see what you think.

  • Offline Sarge   us

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    Offline Sarge

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    Re: Clutch upgrade
    Reply #2 on: Aug 03, 2022, 01.49 am
    Aug 03, 2022, 01.49 am
    *Originally Posted by RobZ900 [+]
    Recently fitted the heavier springs from Barnett to my 2017 in anticipation of having the ECU flashed (done now). The feel at the lever is marginally heavier, but only to the extent that you can feel thereís a difference but without making the clutch pull any harder work. I only wish Iíd done the clutch springs sooner as it feels like the gears are engaging better since the spring change. As for the actuator, recently saw a kit for a different bike where they fitted a spring between the actuator and the casting where the adjustment nuts go to help with the return. Perhaps something to consider if you feel the need, but honestly Iíd just try the clutch springs first and see what you think.

    Thanks, Rob.

    Indeed, the return spring is likely just a very minor annoyance and not the real problem with the earlier models as you (and I) both seem to allude to.

    Hope everything is going well for you across the pondÖcheers!  Thanks for the feedback.

    Craig

  • Offline RobZ900   gb

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    Re: Clutch upgrade
    Reply #3 on: Aug 03, 2022, 08.11 am
    Aug 03, 2022, 08.11 am
    All good thanks. Definitely give the clutch springs a go. I knew I was going to have the ECU flashed and had read that a few people started having problems with clutch slip after tuning the bike, so thought Iíd avoid the problem altogether and fit the clutch springs first. Didnít really know what to expect, but itís great and no clutch slip since.

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    Re: Clutch upgrade
    Reply #4 on: Aug 03, 2022, 02.43 pm
    Aug 03, 2022, 02.43 pm
    *Originally Posted by Sarge [+]
    ...... I want some feedback on which friction and/or drive plates I should use if they are worn out of spec (drive plates blued, etc,)?  If Iím using the Brockís springs, are 2017 OEM clutch components sufficient?

    Thanks in advance.

    Sarge
    Craig

     One of the friction plate part numbers used on the 2017MY is now NLA. Suspiciously it was only ever used on the 2017 Z900 and nothing else prior or since.
     So if you order a fresh set of OEM frictions they will all be the same part number and the clutch will be better for it.

  • Offline Sarge   us

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    Offline Sarge

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    Re: Clutch upgrade
    Reply #5 on: Aug 03, 2022, 02.52 pm
    Aug 03, 2022, 02.52 pm
    Thanks for the info, Cazzy_R; Iíll look into that.

  • Offline Sarge   us

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    Offline Sarge

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    Re: Clutch upgrade
    Reply #6 on: Aug 04, 2022, 05.42 pm
    Aug 04, 2022, 05.42 pm
    Well, I pulled the clutch pack and everything looks good.  The friction plates are all in the middle of the standard thickness range, and the drive plates (once wiped clean) look good with no bluing.  The stacked clutch pack is within the thickness range specified in the manual as well. There is a little wear on the pressure plate ramps, but seems normal for the mileage, with no ridges/burrs, and no bits/shavings present.  The drive plates, pressure plate face, and clutch basket are cleaned, and I have the clutch pack soaking in oil and ready for reassembly, so in will go the Brockís springs!

    Sarge
    Last Edit: Aug 04, 2022, 05.45 pm by Sarge

  • Offline Sarge   us

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    Offline Sarge

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    Re: Clutch upgrade
    Reply #7 on: Aug 06, 2022, 08.08 pm
    Aug 06, 2022, 08.08 pm
    Took my Zed out for a test ride with the Brockís springsÖseems like a different bikeÖand no more slippage.  The clutch lever pull is still nice and light also.

    Sarge

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    Offline RobZ900

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    Re: Clutch upgrade
    Reply #8 on: Aug 06, 2022, 08.11 pm
    Aug 06, 2022, 08.11 pm
    *Originally Posted by Sarge [+]
    Took my Zed out for a test ride with the Brockís springsÖseems like a different bikeÖand no more slippage.  The clutch lever pull is still nice and light also.

    Sarge

    See what I mean, you can tell itís different but without being heavy. Hard to describe, but better isnít it. As it should have been to begin with I think :028:

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    Re: Clutch upgrade
    Reply #9 on: Aug 06, 2022, 08.24 pm
    Aug 06, 2022, 08.24 pm
    I had good results with Brockís springs. Iíd heard the stories of slipping so when my clutch slipped just once under heavy acceleration I ordered Brockís springs and installed them. No slipping any more.
    Iíd describe the pull as still very light only you can actually feel the lever resistance with a gloved hand.

     



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