I assume the skis are on the ground and not on dollies.
Also, ski spring pressure directly affects how much the rear end squats.
I don't know how much you weigh, but that would give a good direction as to what rear spring will work.
The Indy has been out long enough that guys have found the correct spring for their weight with gear and riding style. I 'm sure someone will chime in as to what works for them for a particular weight.

 

X2
You will need to answer these questions to get any decent input

Sent from Snowmobile.com Free App

 

Thanks for the reply. I weigh 315 not suited up and without any junk in the tunnel bag. So I would assume adding a few more pounds for gear (bibs, helmet, jacket and any thing in the tunnel bag) ~320 to 325lbs. Sled was sitting on ground not on dollies. To take measurement made sure back end was all the way up which isn't a problem with the .359 springs on it. Then sat on it and measurement was a drop of 4 1/4".

 

I weigh 250 ish dressed for riding plus have a small under seat bag. I've got the .359 springs. I ride with them on med and the rear blocks on med. So if your 315+ gear you'll definitely want the heavier springs....

 

are the .359 springs the first hd option, or are they the standard springs?

 

They're the first step above stock I beleive....

 

I am not sure what the first HD option is. I changed from stock springs to 7043079-067 (SPRING, TORSION, .359S, 12.5#, BLACK, LH) and 7043080-067 (SPRING, TORSION, .359S, 12.5#, BLACK, RH). That is currently what is on the sled that gives me the 4 1/4" sag. Are there two different kinds of .359 springs?

 

If you have them. Check your stock springs out. The number will be stamped into them on one of the ends. That tells you the wire diameter. For example your .359 springs are stamped 359 somewhere on one of the ends.... Or you can take a micrometer and measure them. O.d. is the spring size....

 

The dealer told me the stock springs were .347 #9 (I can confirm when I get home). I ordered the .359's which was the heaviest that was listed for my sled according to the parts fich. I installed the .359's turned the rear blocks (RRSS) to high and sag went from bottoming out to 4 1/4". It is a ton better than the weak stock springs, however still not to spec. I am not sure if there is any other way to minimize the sag. That is why I was wondering if anyone has used the .359's and that wasn't enough to get sag with in spec. And what if so, what did they do to get into spec. Did they change to the IQ .405 or is there another option.

 

I m running the 359-12s springs. (7043079-67 & 80-67)
I weigh 230, & estimate 250 suited up. I run rr scissors on high,dot forward,fr scissors on high stock position & front track shock spring pressure all the way loose.
IFS shocks have 3" of thread showing. (3 3/8" from nut to ridge)
I have 44 hours of seat time @ 1700 miles dialing in suspension.
6" duec bars which I highly recommend. 126 woodys mega bites that protrude 3/8" beyond the lug height w tunnel protectors.
The sled is a joy to ride. It will bottom on aggressive moguls riding hard. It could use more dampening all the way around if you are aggressive.
I think you will be good @ #2 or #3 torsion spring setting.
#2 setting is to stiff for my weight.
This is a great place to start. I doubt if I ll be changing much more. I like what I have & it is a major improvement from the stock set up...:buttrock:

 

I have some stock IQr sqrings, brand new, if you are interested, I would sell. In southern WI. 53502

 

how much?vvThey fit the Indy rear arm?

 

I live in 53121 area. Delavan/Elkhorn area. Are those .405 springs? If so do they fit the Indy rear arm?

 

Guys, I am not sure if they will fit or not as I do not know what the indy suspension looks like. I know that there is no bend in the long arm of the spring like the fusions had.

 

Pro x skids from 2003 ~2004 are very similar to the current indy skid. I have not had the two side by side but I am sure they work they same , my point to this is the prox or IQR has several spring choices. .347 wire was for soft ride light riders around 120 lbs , .359 was good for a soft ride up to 170 lbs , .375" was good for 240 lbs and a soft ride and last was the .405" springs where good for over 240+ lbs. aggressive riders could cross over to a larger spring and still have some sit in but a firm ride but be able to pound your way down a bumpy trail.

 

2006 Fusion use's same springs

 

I had 375 on my shift way to stiff for me I weigh 250

 

2 Points:

1. You could add X-Click Suspension Adjuster Blocks from starting line products - as they have another setting that is stiffer than the stiffest setting of the stock block.

2. The Indy 600 SP shocks (all 4) are valved extremely light. Thus, I would recommend that you revalve all the shocks. I bought 13 600 SP's a year ago and revalved one before the season and after our first ride it was clear at any speed over 5 mph the revalve was night and day better. The second sled was revalved right away after the first ride.

The good news is that with a SP you can rebuild the shocks as a non SP you can and have to buy new shocks. I think my revavle was about $260 for all 4 shocks.

 

Just ordered the .359's and a IQR chain roller/tensioner from Babbits.

 

Couple of things. Would I need to re valve a brand new shock? Never had shocks I could valve so new to that. And what does the IQR Chain Roller offer?

 

Unfortunately the shocks are so far off on the 600 SP that I would re-valve them before I even rode if I were to buy a new 600 SP. I knew they were off before I bought my sleds but they are much further off than I thought they would be.

 

Wrong thread

 

I'm looking into this for you bocci. Give me a few days. I went through all this with these small coil Dia springs when I had a iq.

I just have to dig my notes up and find the .405 that you need.

 

Awesome Thanks!

 

I started a new topic, "rear spring stuff"

Check it out. Your not the first to complain about the weak springs. I have a guy at work fighting the same issue. x clicks are not the answer, shocks are not the issue, the springs are.

http://www.hardcoresledder.com/foru...om/forums/552-indy-pro-ride-chassis/1423809-rear-spring-stuff.html#post15101753

 

X 2 on the springs. I had stockers in and no matter how I rode it would bottom easily on full hard. Put the .359 springs in and its night and day different! Handles a ton different too!

 

I agree with you on that. I'm 250 ish geared up. I ride the .359 springs on medium most of the time....

 

I had the same problem last season on my new 600SP. First route I tried were the .359's. Little to no improvement. I was at the time about 325lbs geared up with roughly 7" of sag with the stock set up. The .359's reduced that to roughly 6.25". I went with the .405's and had both rear skid shocks re-valved for my weight and riding style. No more issues. Sag is about 2.75". For full disclousure, I did add x-clicks initially with the .359's. Did nothing to improve the issue. However with a re-valve and .405's...they are a must have accessory IMO.

 

Hmmm, I think this is pretty interesting. I weigh about 240 without gear, if I exercise I can get down to 230 pretty easily. I think the .359 may be what I want to go with, but the .405 may be good as well (23 years old, ride like I stole it). I havent got mine, just put down a deposit yesterday, but I know I want to fix up the suspension. Was a major part of the decision to go cheaper with the indy 600 int. because I could spend extra money on tuning.

Deff going to get a revalve, but will do a lot more research and try to figure out where to bring my shocks, or maybe even send them out.

 

Before you touch the shocks, GET THE SPRINGS!!!!! Im almost exactly like you (26, 240 no gear, ride as fast as I can when on trail). It makes a night and day difference!!! I thought about shock revalving, not anymore after the springs.... I was constantly bottoming out no matter how fast/slow I rode, didn't matter if I was standing/sitting. Couldn't really corner, had a bastard of a time trying to get out of a corner cause the skis would come 2 ft in the air. Torsions solved all of this.... BTW I got the .359 I now ride them on med....

 

So what .405 part numbers left and right fit the Indy rear skid properly

 

http://www.hardcoresledder.com/forums/552-indy-pro-ride-chassis/1423809-rear-spring-stuff.html