What clutch spring to buy?

indy_500

indy_500

Well-known member
Got a 99 XC 700, i bought service manual and am going to try and put a new clutch spring in, the clutch is stock with 60 gram weights, i heard some good stuff about the almond blue spring.....???? thoughts?
 
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rmk4ever

New member
Try "pockets" or "xcr 1200" on HCS Pockets knows just how to set up those old pre exhaust valve motors. He'll probably set you up with the correct spring, weights, helix, & carb setting's, oh & a gear also.
 
indy_500

indy_500

Well-known member
still curious. I do have 23/40 gearing (stock is 24/40) and looking for a clutch spring to put in. Don't want to spend the money on helix or weights. Looking for good performance but more or less i just want new one in there.
 
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fredster

New member
Best bet would be to find out what the stock spring was for this sled, it should say so right in the service manual; if you're not going to change anything else, going up one step in 'firmness' will give you somewhat higher engagement RPM as well as higher RPM's at all part-throttle speeds; and more throttle response; go too far and your engine will run too high of RPM's at WOT and you'll lose on top end. Did this with an Indy 440, went up 2-3 steps, great holeshot but higher RPM's at all speeds and would overrev on top end and actually lost top end. But was great fun in the woods, corner-to-corner.
 
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toddspolaris

Member
Hey Indy, if your looking just to increase your engagement only, go to Erlandson Performance and get the red spring. your stock spring is dark blue and the spring tension is 120 lbs to 300 lbs and the red spring that EPI offers starts out at 145 lbs to 300 lbs. hope that helps. It will increase your rpms up about 500 rpms at engagement only
 
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toddspolaris

Member
Hey Indy, Polaris did make a silver spring which comes in at 80lbs and at full compression is 280lbs. definately the wrong spring but I don't know if that is a polaris spring. EPI also makes a silver spring which starts out at 165lbs and at full comp. 300lbs. That spring there would give you a very high engagement. What does it engage at now?
 
indy_500

indy_500

Well-known member
toddspolaris said:
Hey Indy, Polaris did make a silver spring which comes in at 80lbs and at full compression is 280lbs. definately the wrong spring but I don't know if that is a polaris spring. EPI also makes a silver spring which starts out at 165lbs and at full comp. 300lbs. That spring there would give you a very high engagement. What does it engage at now?
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I couldn't exactly tell you what it engages at since i only drove it for 300 miles last year before i put a stud thru the heat exchanger. And, i just regeared so i won't be able to tell when it truly engages. If it was the Polaris silver spring when would it engage at?
 
indy_500

indy_500

Well-known member
could i measure the thickness of the spring with a caliper to figure out which one it is? or would it say if it was an epi one on there already?
 
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xcr440

Well-known member
indy_500 said:
I couldn't exactly tell you what it engages at since i only drove it for 300 miles last year before i put a stud thru the heat exchanger. And, i just regeared so i won't be able to tell when it truly engages. If it was the Polaris silver spring when would it engage at?
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Indy, engagement is RPM, not speed. You could put it on a stand and watch when the clutch grabs the belt, at that RPM is the engagement.
 
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doomsman

New member
You can test a spring with a bath scale on a drill press and a ruler.
Be sure to put a board on the scale to spread the load.

IMG_0486.jpg
 
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