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SLP 40-66 primary spring which is 120-300lb rating, a polaris gold or black secondary spring (they are the same spring w/ same lb ratings, just different part numbers & color is all). And IF YOU CAN find one...and that is a big IF...Try to find a EPI Helix with the part number QA-2. It is a Quad Angle helix that does wonders on that sled, also I switched to slippery buttons because of longevity but I also used it with stock regular old cheap buttons and it worked fine. Don't bother with switching out weights, there isn't any advantage to that. That sled works best with the stock M5 weights. Call EPI to see if they have any left on the shelves, sometimes they find one laying around. I've been checking eBay for awhile now to find another one but no such luck there so EPI is your best bet. Also one thing I will say is I am not a fan of EPI's suggestion for the primary spring on the sled, I tried it but bleh, the 120-300 works better imho. They make a clutch kit for it with helix and their 2 springs suggestions but at 165 dollars you can do it cheaper and with better springs imho. I love EPI products but not for that engine and clutch combination.
 

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Discussion Starter #22
SLP 40-66 primary spring which is 120-300lb rating, a polaris gold or black secondary spring (they are the same spring w/ same lb ratings, just different part numbers & color is all). And IF YOU CAN find one...and that is a big IF...Try to find a EPI Helix with the part number QA-2. It is a Quad Angle helix that does wonders on that sled, also I switched to slippery buttons because of longevity but I also used it with stock regular old cheap buttons and it worked fine. Don't bother with switching out weights, there isn't any advantage to that. That sled works best with the stock M5 weights. Call EPI to see if they have any left on the shelves, sometimes they find one laying around. I've been checking eBay for awhile now to find another one but no such luck there so EPI is your best bet. Also one thing I will say is I am not a fan of EPI's suggestion for the primary spring on the sled, I tried it but bleh, the 120-300 works better imho. They make a clutch kit for it with helix and their 2 springs suggestions but at 165 dollars you can do it cheaper and with better springs imho. I love EPI products but not for that engine and clutch combination.
You u happen to have a link to one I can’t find what your talking about sorrrry
 

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Primary Spring SLP 40-66 which is 120-300lb rating or the same as the Polaris part# 7041080


Polaris Secondary Spring, replace the secondary spring buttons as well when you do


Polaris Secondary buttons


For the Helix you need to call EPI directly, don't email call them as it is easier. Ask for parts department. They won't tell you the angles as they are stupid crazy about hiding information. Do not let them sell you on buying their Purple secondary spring. I tried it and it is just too much for that sled.

 

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Discussion Starter #24
Primary Spring SLP 40-66 which is 120-300lb rating or the same as the Polaris part# 7041080


Polaris Secondary Spring, replace the secondary spring buttons as well when you do


Polaris Secondary buttons


For the Helix you need to call EPI directly, don't email call them as it is easier. Ask for parts department. They won't tell you the angles as they are stupid crazy about hiding information. Do not let them sell you on buying their Purple secondary spring. I tried it and it is just too much for that sled.

And you have these on your Indy 500 also?
 

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Yes I have them in my '98 Indy 440 L/C and my '97 Indy 500 as well. The red spring from factory in the secondary is junk, it is junk from factory. I worked at a dealer in the '90s and any sled that came with that red spring we would rip them out and put in the gold/black spring right away. However it is showing that your 1998 could have the Gold spring in the secondary. IF so then I would replace the buttons as those need to be replaced every 1500-2000 miles on those and try to find that Helix. That helix is a Quad Angle Helix that shifts through 4 angles vs the Single Angle Helix yours has now stock. It makes a world of a difference with shifting. Just remember your helix has holes in it to determine where that tabbed spring will go. The farther you go to the left the more low end torque you will have and less top end. The farther you go to the right the more top end you will have and less low end torque. Polaris made 3 types of helixes with for those sleds one with 3 holes, 4 holes and 5 holes. For the 3 hole and 5 hole the balanced setup is directly in the middle, for the 4 hole helix it is number 2 or 2nd one from the left. The QA-2 from EPI should come with 5 holes and I have mine set at number 2.

The primary spring in a '98 Indy 500 stock is a Gold which is 100-275lb rating. What you are doing is increasing the engagement up to 4000-4400 which is perfect for that sled. And it will increase your top end rpm's as well giving you a little bit more throughout your power band. Springs are also made to be replaced so often as well.

I tried the EPI springs they recommended and it was too much on the engagement and too much on the secondary spring lb ratings. I have tried about 20 different combinations to come to this setup. I am finally happy with it on the trails.

If you think it is too much then you go back, it takes 5 mins to switch out a primary spring.
 

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Discussion Starter #26
Yes I have them in my '98 Indy 440 L/C and my '97 Indy 500 as well. The red spring from factory in the secondary is junk, it is junk from factory. I worked at a dealer in the '90s and any sled that came with that red spring we would rip them out and put in the gold/black spring right away. However it is showing that your 1998 could have the Gold spring in the secondary. IF so then I would replace the buttons as those need to be replaced every 1500-2000 miles on those and try to find that Helix. That helix is a Quad Angle Helix that shifts through 4 angles vs the Single Angle Helix yours has now stock. It makes a world of a difference with shifting. Just remember your helix has holes in it to determine where that tabbed spring will go. The farther you go to the left the more low end torque you will have and less top end. The farther you go to the right the more top end you will have and less low end torque. Polaris made 3 types of helixes with for those sleds one with 3 holes, 4 holes and 5 holes. For the 3 hole and 5 hole the balanced setup is directly in the middle, for the 4 hole helix it is number 2 or 2nd one from the left. The QA-2 from EPI should come with 5 holes and I have mine set at number 2.

The primary spring in a '98 Indy 500 stock is a Gold which is 100-275lb rating. What you are doing is increasing the engagement up to 4000-4400 which is perfect for that sled. And it will increase your top end rpm's as well giving you a little bit more throughout your power band. Springs are also made to be replaced so often as well.

I tried the EPI springs they recommended and it was too much on the engagement and too much on the secondary spring lb ratings. I have tried about 20 different combinations to come to this setup. I am finally happy with it on the trails.

If you think it is too much then you go back, it takes 5 mins to switch out a primary spring.
Yes I have them in my '98 Indy 440 L/C and my '97 Indy 500 as well. The red spring from factory in the secondary is junk, it is junk from factory. I worked at a dealer in the '90s and any sled that came with that red spring we would rip them out and put in the gold/black spring right away. However it is showing that your 1998 could have the Gold spring in the secondary. IF so then I would replace the buttons as those need to be replaced every 1500-2000 miles on those and try to find that Helix. That helix is a Quad Angle Helix that shifts through 4 angles vs the Single Angle Helix yours has now stock. It makes a world of a difference with shifting. Just remember your helix has holes in it to determine where that tabbed spring will go. The farther you go to the left the more low end torque you will have and less top end. The farther you go to the right the more top end you will have and less low end torque. Polaris made 3 types of helixes with for those sleds one with 3 holes, 4 holes and 5 holes. For the 3 hole and 5 hole the balanced setup is directly in the middle, for the 4 hole helix it is number 2 or 2nd one from the left. The QA-2 from EPI should come with 5 holes and I have mine set at number 2.

The primary spring in a '98 Indy 500 stock is a Gold which is 100-275lb rating. What you are doing is increasing the engagement up to 4000-4400 which is perfect for that sled. And it will increase your top end rpm's as well giving you a little bit more throughout your power band. Springs are also made to be replaced so often as well.

I tried the EPI springs they recommended and it was too much on the engagement and too much on the secondary spring lb ratings. I have tried about 20 different combinations to come to this setup. I am finally happy with it on the trails.

If you think it is too much then you go back, it takes 5 mins to switch out a primary spring.
Ok I can’t find that helix you are talking about
 

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Call EPI as that is probably your best bet. If you have called them you are probably out of luck. I would just keep trying eBay and what not now and then. EPI's website is below. The stock helix works good just not as good as that quad angle. I have used that spring combination with the stock helix and it ok. Changing out those springs alone will have a good effect on your sled even with a stock single angle helix. Someone in the past has said that Polaris had a tri-angle helix that would work as well but I have never been able to confirm it exists.

 

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Discussion Starter #28
Call EPI as that is probably your best bet. If you have called them you are probably out of luck. I would just keep trying eBay and what not now and then. EPI's website is below. The stock helix works good just not as good as that quad angle. I have used that spring combination with the stock helix and it ok. Changing out those springs alone will have a good effect on your sled even with a stock single angle helix. Someone in the past has said that Polaris had a tri-angle helix that would work as well but I have never been able to confirm it exists.

Ok and if I where to do it without a helix would that still give me more power
 

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Ok, I have to ask how did a silver get in there? Because no that is not correct at all. If it is silver/gold that is a spring that you definitely don't want in there. Unless it is an aftermarket spring, then the only person who made or makes a silver is EPI and that is waaaaaaay overkill on that engine and clutch. What does it engage at right now? And what does it max out at right now at the very top of its rpm's?

You are never going to get more power out of a Indy 500. They key to them is how it shifts and back-shifts throughout the entire rpm range. By improving it you will get there quicker and you will be better out on the trail. Top end speed is not going to change.
 

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Discussion Starter #31
Ok, I have to ask how did a silver get in there? Because no that is not correct at all. If it is silver/gold that is a spring that you definitely don't want in there. Unless it is an aftermarket spring, then the only person who made or makes a silver is EPI and that is waaaaaaay overkill on that engine and clutch. What does it engage at right now? And what does it max out at right now at the very top of its rpm's?

You are never going to get more power out of a Indy 500. They key to them is how it shifts and back-shifts throughout the entire rpm range. By improving it you will get there quicker and you will be better out on the trail. Top end speed is not going to change.
It engages at around 4500 and haven’t really kept it fully pinned yet but was around 50
 

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yeah 4500 is too high, that is a EPI spring it sounds like which is 165-300LB rating. 165 is waaaaay too high for that sled. You want the engagement at 4000-4400. I just put in a new SLP 40-66 in mine yesterday as mine had 1500 miles on it between 3 sleds so I switched it out to a new one. I am going to fire it up tomorrow. I will let you know what the engagement is on it. Polaris Silver is 77-240LB rating.

Your top end should read around 90-100 on a flat ice service. Now you will not be going that fast as sled speedometers are not that accurate,lol. I wish that sled would do that but that is wishful dreaming.

And you say 50 as in 5,000 rpm's or 50mph? Because if that is the case yeah something is definitely off on that clutching. I can check but I am not 100% positive but I "might" have another gold spring laying around at my parents garage which is where the sleds are kept. I'll look tomorrow when I am there. If it is there then I can ship it to you for the cost of shipping.
 

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Discussion Starter #33 (Edited)
yeah 4500 is too high, that is a EPI spring it sounds like which is 165-300LB rating. 165 is waaaaay too high for that sled. You want the LB rating at 4000-4400. I just put in a new SLP 40-66 in mine yesterday as mine had 1500 miles on it between 3 sleds so I switched it out to a new one. I am going to fire it up tomorrow. I will let you know what the engagement is on it. Polaris Silver is 77-240LB rating.

Your top end should read around 90-100 on a flat ice service. Now you will not be going that fast as sled speedometers are not that accurate,lol. I wish that sled would do that but that is wishful dreaming.

And you say 50 as in 5,000 rpm's or 50mph? Because if that is the case yeah something is definitely off on that clutching. I can check but I am not 100% positive but I "might" have another gold spring laying around at my parents garage which is where the sleds are kept. I'll look tomorrow when I am there. If it is there then I can ship it to you for the cost of shipping.
Ok thank you so much

acaully just cheacked jt is a gold?‍♂?‍♂?‍♂ Sorry it looked silver but I put a flashlight on it and saw that
 

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I am going to fire mine up tomorrow with the new spring will double check what the engagement is on mine. 4500 on a gold spring tells me it is worn out. I had a gold spring originally in mine when I bought it and it was engaging at around 3800.
 

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Discussion Starter #35
I am going to fire mine up tomorrow with the new spring will double check what the engagement is on mine. 4500 on a gold spring tells me it is worn out. I had a gold spring originally in mine when I bought it and it was engaging at around 3800.
Ok so u still recommend changing the secondary
 

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Changing the primary and secondary springs with new buttons. But let me double check tomorrow what the SLP spring engages at just to be safe. I talked to my guy at Polaris today about a couple things and he said yeah that is the spring you go with if you want to go one up over the gold in the primary and that the gold/black with the 25-44LB rating is the best choice for those sleds.
 

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Okay so finally got around to firing mine up today and it engages around 4200-4400 depending on how hard you hit the throttle which is perfect for that sled. I did find a gold secondary spring, I know it doesn't have many miles on it maybe 300 if that before I switched it out to a different EPI spring I was trying and then went back to gold again. The purple EPI spring works good but I like the gold better, some have better luck with that purple EPI in the secondary though I will say that.

So if you want to send me your name/address via private message I'll get this out on Monday and you can send me the shipping costs after it is sent as it shouldn't be too much as it is very small and lightweight.
 
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