EBC Clutch springs?

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EBC Clutch springs?

This is a discussion on EBC Clutch springs? within the ZR-7 Maintenance forums, part of the Kawasaki ZR-7 category; Has anyone replaced their clutch and used EBC CSK38 clutch springs while doing the clutch? I just swapped out my clutch and got EBC springs ...

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Thread: EBC Clutch springs?

  1. #1
    Newbie redhead1331's Avatar
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    EBC Clutch springs? W/ PIC

    Has anyone replaced their clutch and used EBC CSK38 clutch springs while doing the clutch? I just swapped out my clutch and got EBC springs wich say they are supposed to be 10% stronger than stock. when I squeeze the stock and EBC springs the stock feels stiffer, got my girlfriend to squeeze them and she agrees. The springs came in a pack with 6 springs when the zr-7 only uses 5... nbd but the wire is a smaller gauge and is slightly longer, but i would expect that of a new spring over the used one. Anyway I took a ride on the bike today and the clutch is still slipping alittle... The cable is adjusted correctly, but im thinking about taking these springs out and trying the stock ones. Of corse that means draining the $20+ dollars worth of oil to do so. Anybody else use these springs? was the wire gauge skinnier? did they feel softer? should I try the stock springs with the new clutch plates? Oil is Lucas 10-40 Semi Synthetic.
    IMAG0177-1.jpg
    stock is on the right.
    Last edited by redhead1331; 04-23-13 at 09:03 AM.

  2. #2
    Supreme Being sh0rtlife's Avatar
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    i did...but i used one of the better brands "race" springs..and god the whole thing feels MUCH better....mine were red?..thicker and longer

  3. #3
    Newbie redhead1331's Avatar
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    I rode the bike again and the clutch still slipped pretty bad if not worse... drained the oil and put the stock springs (that were still in spec) back in. Clutch slip is pretty much gone. If I accelerate all out I can feel the rpm's drift up ever so slightly when grabbing the next gear, but that is the only time and i rarely ever ride it like that.

    sh0rtlife, do you remember which brand you bought?

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    Supreme Being sh0rtlife's Avatar
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    i had to go digging but it was the barnett race springs...they are STIFF....and my clutch has zero slip....i had pretty much the same slip to minor slip you had..you need new springs even if they are new oem

  6. #5
    Newbie redhead1331's Avatar
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    I have been in contact with EBC customer support about their clutch springs for the ZR-7. Their website lists a part # CSK38 for the Zr-7, supposed to be 10% stronger than stock, so that's what I bought. Got them in the mail and put them in... looked too soft but tried them anyway and the clutch slipped after about 5-6k RPM (new friction plates as well). Contacted customer support after putting the stock springs back in (felt stock) to let them know the springs are incorrect. They say that they may have been packed incorrectly, can they send me another set of CSK38 springs...OK, I got another set of CSK38 springs that were identical to the first set I purchased which also wouldn't work (looked and felt softer). I let them know that these were undoubtedly weaker than stock and that stock also had a problem with being too weak. I was told they went back into their OEM samples and found that they had another spring CSK 117 that was the same dimension as stock springs and tested "using a newton method of measurement on our pressure machine" 11% stronger than stock.Just got them in the mail today and will be putting them in tomorrow but can already tell these are stiffer than stock and according to EBC OEM samples are 11% stronger. Im hoping that EBC will be making the change to their application guide, but anybody looking for clutch springs for your ZR-7 get CSK117 NOT CSK38! I'll report back after I ride with these springs,but can already tell they were what i was looking for, NOT CSK38

  7. #6
    Rising Star GreyGhost's Avatar
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    good luck

  8. #7
    Obo
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    Between suppliers and dealers giving the wrong parts, I'm surprised we don't have more troubles in general with our rides.
    2004 Kawasaki ZR-7S
    complete with extra "stuff"

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  9. #8
    Newbie redhead1331's Avatar
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    I finally got the CSK117 springs installed in my bike and found a fraying clutch cable about an 1-2 inches from the motor side of the cable while taking it apart. So after putting the springs in I had to wait more than a week to get a new cable in the mail. After getting it all back together with new clutch cable, new EBC clutch fibers, and the CSK117 springs (not the CSK38 spring EBC has listed for the ZR-7) the clutch feels great! Clutch feels stronger than it ever has, and I bought the bike with 1,845 miles. My clutch was slipping at high RPM upshifts, which I hear is common with other ZR-7 bikes with stock clutch springs. With the CSK117 spring I couldn't get it to slip even with a passenger on the back of the bike. If you have a ZR-7 you know this bike flattens out up top and it is rare that I ever ride the bike like that (High RPM Upshifts). These springs have made a big difference in how the bike shifts even under normal riding conditions. The clutch feels much stronger during upshifts and downshifts. The "soft" feel is gone, and the bike's transmission feels much more crisp and precise! If you still have stock Kawi springs in your bike, you are missing out. Get yourself a pair of EBC springs part #CSK117 NOT part #CSK38 that is currently listed on their website for the bike.
    hausdok likes this.

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    Obo
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    Thanks for the update redhead, and good job on finding that frayed clutch cable. Nothing worse than losing one of those out in the "wilds" and being forced to shift based on engine rpm's. Worst is trying to get going from a dead stop.
    2004 Kawasaki ZR-7S
    complete with extra "stuff"

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  11. #10
    Supreme Being shakennstirred's Avatar
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    I have just got some of the CSK117 springs after reading this thread.
    my clutch slips alittle at high rpm when changing gear like a lot do, but is fine when you roll the power on in top
    so for just £10($15) I thought it a great cheap upgrade

  12. #11
    Supreme Being Bradmeister's Avatar
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    Redhead1331,

    So true about those damn Clutch Springs! I see this happening on Brand new bikes across the marque of Manufacturers!

    Just last week, a buddy came buy having the same issue with his clutch springs on his KTM 250SXF! Same thing, Barnett, EBC, Moose, stock... You're not going to Believe this, but after a few phone calls we installed a clutch spring set (I had laying around for the last 2 years) from a Honda 450 Motocross Bike! Worked better than stock from factory or Aftermarket! Go Figure........ sometimes I wonder if they know what there building and the Quality of Assurance. Maybe that's a lack of Quality control......lol.

    Great find on the Cable, +1 with OBO.

    Cheers

  13. #12
    Supreme Being shakennstirred's Avatar
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    update on mine
    just fitted the new CSK117 springs and while the case was off I thought I may as well put new plates in also.
    was an easy job and didn't take long.
    nice clean Castrol power racing full synthetic in also

  14. #13
    Rising Star tmoons's Avatar
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    Did anyone measure the length difference between the CSK117 and the CSK038? I got an engine (donor) with what the seller claims to be an upgraded clutch spring set. BUT judging from his other "improvements" i think he just followed the sellers advice (in this case ending up with CSK038) and not with the correcter CSK117. But with only "the naked eye" to judge them, i would like to know if there is a way of telling which ones i have here.

  15. #14
    Supreme Being shakennstirred's Avatar
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    Quote Originally Posted by tmoons View Post
    Did anyone measure the length difference between the CSK117 and the CSK038? I got an engine (donor) with what the seller claims to be an upgraded clutch spring set. BUT judging from his other "improvements" i think he just followed the sellers advice (in this case ending up with CSK038) and not with the correcter CSK117. But with only "the naked eye" to judge them, i would like to know if there is a way of telling which ones i have here.
    sorry don't know the length difference between the csk117 and csk38.
    but the standard one and the csk117's are the same length so if you have some that are shorter or longer than a known standard spring you have your answer
    the standard springs thickness of the coils is 2.60mm
    the csk117.s thickness of the coils is 2.67mm
    the bag they came in says there 15% stronger
    Last edited by shakennstirred; 09-19-15 at 04:23 PM.
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  16. #15
    Rising Star tmoons's Avatar
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    Mine (the "upgraded" ones) came in just over 35 mm (1.4 inche).
    i'll check with the other set i have removed yesterday from the Z750GT (shaft drive )

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