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Old 12-05-2002, 03:12 AM
Pro Rider
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Join Date: Oct 1999
Posts: 1,267
Default Primary spring chart

I tested several manufacturers primary springs on a spring scale today . I had a total of 12 springs ,they were all brand new .

My readings may vary from the manufacturers , but the whole point of this is to show springs relations to each other . My scale is repeatable to a variance of about 3 pounds , I have checked this by retesting the same spring several times . I do find springs (of the same color code) can vary often by more than that.

I always thought an EPI red and a polaris white were identical . The two springs appear to be the same , and maybe they are , I may have gotten a wimpy white spring . I tested several EPI reds and they all tested close together , the polaris white is just a little lower . I have another new white spring coming to test tommorow .

My scale is not a high quality certified scale , I am using a common bathroom scale in my press with a tool I made to hold the spring and allow me to compress it while I read the calibrations on the side . The poundage may be off but the tests are repeatable with in the variances I have previously mentioned .

I put this list together so at least we can all see how these things measure on the same day , on the same tester . I hope this helps you all in tuning your clutches .

Color 2.5" 2.25" 2.0" 1.75" 1.5" 1.25"
Kawasaki V-force 0---------------------120
Polaris blue/green 5 24 46 66 90 117
Dalton plain/white 13 30 47 65 86 105
Dalton blue 3 26 52 81 111 145
Polaris white 34 52 72 93 116 140
EPI red 37 57 76 97 118 140
Dalton black/white 39 57 77 100 122 144
Polaris green 43 61 78 96 116 140
Dalton black/orange53 71 88 106 125 150
Aaen green 54 73 91 112 130 154
EPI orange 79 91 102 118 130 145
Dalton orange/blue 17---------------------160
Comet black 36--------------------167
HPD plain 32 65 102 145 185 235
Polaris orange 72 92 115 141 166 196
HPD red/yellow 118 139 161 187 214 243
HPD red 135 162 183 206 229 253
Dalton Black/red/white147 177 204 234 267 298
HPD violet 153 179 206 229 252 281
EPI maroon 199 228 245 277 303 330

Adjusted 12-16-05
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Old 12-05-2002, 04:02 AM
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Join Date: Jun 2001
Posts: 284
Default Primary spring chart

Thanks Rick now only if I knew what the Hell i was looking at.

how about HPD light blue and violet?

Thanks and Merry Christmas From Ramie
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Old 12-05-2002, 11:24 AM
Pro Rider
Join Date: Aug 2000
Posts: 2,417
Default Primary spring chart

I found that very interesting.

All my testing was done on my machine, and by best guessing, but your chart proved my initial impressions right. I tried the green & white Polaris springs, and I thought they had about the same total shift out, but the green had a higher engagement RPM, and the RPM difference dwindled to about nothing at full shiftout.
About all I could ask would be to add the blue/green spring for comparison to where I started from.

Great info, by the way, Thanks for going to the trouble of checking all that out for us!!
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Old 12-05-2002, 12:30 PM
Pro Rider
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Join Date: Oct 1999
Posts: 1,267
Default Primary spring chart

Woops !

I fixed that farmer . I had a typo , the first spring tested is blue/green .

I may have a light blue bere I can check , I know I don't have a violet . Let me see what I can do Ramie .
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Old 12-05-2002, 06:38 PM
Extreme Pro Rider
Join Date: May 2002
Posts: 3,042
Default Primary spring chart

Rick, for Jay and mine's sake, test some high end EPI's. They have one rated at 325lbs at full shift out. It is rated at about 200lbs engagement I think.Bubba
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Old 12-05-2002, 08:08 PM
Pro Rider
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Default Primary spring chart

Bubba ,
I don't have any of the springs you mentioned . If you mail me some I will test and return .
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Old 12-05-2002, 09:20 PM
Range Rover
Join Date: Feb 2002
Posts: 111
Default Primary spring chart

An EPI Red and a Polaris White probably are identical springs. It's nearly impossible to manufacture springs so that they completely respond the same and are still affordable. (This is true of many parts). There's a certain balance of cost versus consistency that has to be considered. I'll bet that there's at least plus/minus 5% tolerance on the value of the spring constant that most manufacturers allow between lots. Could be wrong though. Great work with the list!
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Old 12-06-2002, 12:55 AM
Range Rover
Join Date: Nov 2000
Posts: 102
Default Primary spring chart

Hello Rick.I bought the polaris(?)plain from you awhile back for my explorer.How does this rate next to the polaris white.Only have about 2 miles on this spring and Im still trying to see if Im gonna like it.
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Old 12-06-2002, 11:09 AM
Join Date: Nov 2002
Posts: 84
Default Primary spring chart


One heck of a great gesture. You ARE the man.

Thanks a lot!


Those are the values one would graph to see the relative behaviors of the spring. you would create the same chart listed in your service manual (or as on the web @ HPD) but with MUCH more complete data. Its a uniquely useful tool is discussing spring relationships.
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Old 01-24-2003, 05:52 PM
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Join Date: Oct 1999
Posts: 1,267
Default Primary spring chart

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