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> Upgrading rear torsion springs for 121, and 136 Switchback/LX
Bowana
post Mar 22 2009, 01:06 PM
Post #1


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From: Regina, Saskatchewan
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Current Vehicle:
2010 800 Switchback
Age: 57



Hi,

I have been taking a pounding most of the winter on MY 08 Turbo Dragon and after making sure the shocks have enough air and cranking everything up as hard as they go with the cam adjusters and the scissor stops, I have decided to put in the heavier springs. I have done this on my XC's and older XLT's as well. I weigh about 245 dressed (or at least that is what I admit to).

Usually with the harder springs I can back the adjuster off to the medium setting and get better "ride in" without bottoming on the big bumps or the compression bumps at the bottom of an incline just as you start up the other side.

Looking at the Polaris parts list, it shows that we have a 7043080-067 RH and a 7043079-069 LH spring which are .359 in square diameter with 12.5 #'s of compression. The spec sheet from my service manual shows that we have a .359 square spring with an 80 degree angle. The parts listing also shows optional springs at .347 80 degree and 11# and .347 77 degree and 9# which are all softer springs then I have from stock.

My local dealer said that they use springs from the 2005 Fusions which are the 7043128-067 and 7043129-067 springs and have a .405 diameter.

I ordered these springs and when I went to install them today I have discovered that the centre hole in the springs where they slide over the Torsion Spring Sleeve is 1" larger on the .405's then on the std .359's. I then looked at the parts listing for the Fusion and found that, although they do list these springs as the optional spring for the fusion they do not mention that you must change the Torsion Spring Sleeve when upgrading to the stronger spring.

It just doesn't look like it will work properly with an inch of freeplay.

The 2006 and 2006 Fusions use the same springs that we use as stock but the 05 is the only sled I could find with an option to bring the spring heavier than the stock .359's as the books show two stages lighter but nothing heavier.

I am sure that someone must have been down this road before and have the answer that I am looking for and that is (1) do I have to find a new Torsion Spring Sleeve for the bigger diameter springs or
(2) use them the way they come and the tension will hold them in place?
(3) I have the right idea but the wrong part number for the spring that I need to upgrade

I apologize for being a bit long winded but wanted to insure that I have supplied the right information.

Thanx

This post has been edited by ExcursionPSD: Dec 25 2010, 11:16 PM


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2010 800 Switchback . 11-12 Mileage 0. Dually carbides, Tunnel bag by Polaris. Gears Handlebar ag. .405 torsion springs, Polaris hand guards, tinted windshield. Rear rack. Centre headlight. Skid Plate. Rear rack and extra idler wheels. Factory cover. FOR SALE $7500 CDN 4500 miles
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ExcursionPSD
post Mar 23 2009, 08:59 PM
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07 FST Cruiser
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Bowana,

If you look in Polaris/Victory Online Parts Catalog and bring up the 2008 IQ Turbo Dragon, I think that you will find the parts on your sled, match the online parts book. Polaris has not put any FST powered sleds on a Full Raw chassis. All FST have a radiator, Rider Select steering column, running board coolers, solid running boards.

I don't think that the oversized ID on the heavier hairspring coils is going to cause a problem. They are under constant tension, and will not be rattling around.

This post has been edited by ExcursionPSD: Mar 30 2009, 11:58 PM


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07 FST IQ Cruiser. 15,710 miles SLP Powder Pros, 10" carbide, Fox Float IFS, MY09 LW spindle, skidplate, Racecraft intercooler & boost box, ELA Gen II exhaust, Precision Sports 2012 reflash & HD eng. mounts, full SLP intake, heat control and venting package, 136 x 1.25 RipSaw full clipped w/144 plastic doubled XL Fast-Trac 1.375 studs, Avid-Products.com external drivers on axle, revalved M10 Fox shocks, 4 inner and 2 outer idlers added, Receiver hitch & projector beam installed. rzimmer underdrive alt. pulley. AMSOIL fluids by MAXoil.com

10 600 CFI LX INTL Red Powder Pro skis, red skidplate, 108 double XL Fast-Trac 1.375, 4 rear idlers, receiver hitch

07 600 CFI Switchback Red Powder Pro skis, projector beam, red skidplate, 116 double XL Fast-Trac 1.375, receiver hitch

previously 06 FST IQ Touring SLP Powder Pros, 136 1.25 IceRipper
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Bowana
post Mar 23 2009, 09:49 PM
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2010 800 Switchback
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QUOTE(ExcursionPSD @ Mar 23 2009, 08:59 PM) *
If you look in Polaris/Victory Online Parts Catalog and bring up the 2008 IQ Turbo Dragon, I think that you will find the parts on your sled, match the online parts book. Polaris has not put any FST powered sleds on a Full Raw chassis. All FST have a radiator, Rider Select steering column, running board coolers, solid running boards.

I don't think that the oversized ID on the heavier hairspring coils is going to cause a problem. They are under constant tension, and will not be rattling around.

You may very well be right with the larger diameter spring being the only answer Polaris has to providing a heavier spring for my application. If this is their answer, so be it. This will now be my 4th sled with a spring upgrade and the 1st time that the spring has a diameter of an inch larger than the one being removed so you can understand my reluctance to install them without being absolutely sure they are what is recommended and what they are actually using. We all work hard for our money and I am sure there would be issues if something broke as a result of my installing the springs and they were found not to be correct.

The previous post has an Edge Chassis which uses 7041940-067 & 7041941-067 springs as the 405 replacement and are used from 2001-2009 edge chassis. The listing does not show them for an IQ.

The 7043079-067 & 7043080-067 stock spriongs for the IQ chassis areusaed on various IQ, Fusion, Shift and Switchback sleds from 2005 to present. The parts listing only shows the heavy springs being used in the 2005 900 Fusion, 2007 600 IQ/LX Cleanfire and the 2007 700 Cleanfire Dragon/Euro and that is why I am questioning the part number and the product laying on my bench. The number is good but the application may not be.

I also realize that once it is installed there is loaded pressure on the coil stack at all times and that is why when the Torsion Spring Sleeve 5434989 is removed for inspection that there are only indents form the spring stack on one side of the sleeve. This same sleeve is also used on just about everything that Polaris makes and is also used on the 05 Fusion so you are probably correct in that they did not make a special spring sleeve for the heavier springs or they would have indicated something in the service manual.

There are always the little disclaimers when an item is produced and the video is shot and that is that the manufacture has the right to make changes at any time and the picture you are looking at may or may not resemble the sled on your trailer. (my words but you get the idea) That IMO is what happened when they put the on-line brochure together using the RAW chassis and the Turbo for 2008. I'm not complaining but just pointing it out for those technical types out there as I am quite confident that we have a few very good ones on this site, me NOT being one of them. Heck we will have all summer to pick things apart as this week-end looks like our last week-end to ride as it is turning cold tonite and will hold the snow until at least Saturday.

As stated, I hope to provide the official Polaris factory answer to the spring issue tomorrow night and then we will all know.


--------------------
2010 800 Switchback . 11-12 Mileage 0. Dually carbides, Tunnel bag by Polaris. Gears Handlebar ag. .405 torsion springs, Polaris hand guards, tinted windshield. Rear rack. Centre headlight. Skid Plate. Rear rack and extra idler wheels. Factory cover. FOR SALE $7500 CDN 4500 miles
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Posts in this topic
Bowana   Upgrading rear torsion springs for 121   Mar 22 2009, 01:06 PM
Snobeeler   Hi, I have been taking a pounding most of the win...   Mar 22 2009, 02:53 PM
Bowana   I am going to those springs also. Team Tip S-05-02...   Mar 22 2009, 03:22 PM
Snobeeler   I looked at this information as it is in the servi...   Mar 23 2009, 06:44 AM
Bowana   The spring stack will get wider as the suspention ...   Mar 23 2009, 05:06 PM
cadboy1   On my 04 Super sport I installed the .405 springs ...   Mar 23 2009, 05:56 PM
Snobeeler   You may very well be right with the larger diamete...   Mar 24 2009, 07:12 AM
Bowana   My dealer forgot to order my springs. :angry: The...   Mar 24 2009, 12:55 PM
Snobeeler   Two phone calls from my dealer and a couple of e-m...   Mar 24 2009, 02:20 PM
Bowana   Interesting, I checked the part numbers in the tea...   Mar 24 2009, 06:33 PM
Snobeeler   I have the Service manual Part # 9921066 2006-2008...   Mar 25 2009, 06:20 AM
cadboy1   presssure on the coil stack is constant once both ...   Mar 25 2009, 08:04 PM
Bowana   When I put my Edge together with the larger hole s...   Mar 25 2009, 10:53 PM
cadboy1   I now remember when I upgraded my springs on the 0...   Mar 26 2009, 01:56 PM
Bowana   That was the hardest part with the swap on the Edg...   Mar 27 2009, 03:55 PM
Bowana   I have decided to change to the big springs and ju...   Mar 30 2009, 12:53 PM
Snobeeler   Just a quick update to the results of my spring ch...   Mar 30 2009, 05:06 PM
Bowana   Thanks for the update. All my parts are in EXCEPT ...   Mar 30 2009, 06:09 PM
ExcursionPSD   There was a thread started a year ago, that covers...   Mar 31 2009, 12:04 AM
Snobeeler   There was a thread started a year ago, that covers...   Mar 31 2009, 12:37 AM
Snobeeler   The same hairsprings or torsion springs are used o...   Apr 14 2009, 04:25 PM
guyzoun   Ok, put the right side spring on today with the ne...   Apr 19 2009, 08:54 AM
Snobeeler   This is a very good thread. Thx snobeeler for thes...   Apr 19 2009, 10:12 AM
Snobeeler   Ok, put the right side spring on today with the ne...   Jan 14 2010, 06:47 PM
Bowana   Ok, rode 900 miles with heavier torsion springs AN...   Jan 14 2010, 08:20 PM
cropsprayer   I know about a year ago heaver rear springs was on...   Dec 24 2010, 08:19 AM
Snobeeler   I know about a year ago heaver rear springs was on...   Dec 24 2010, 09:27 AM
cropsprayer   Here is the Team Tip with part #s Here is th...   Dec 24 2010, 08:52 PM
JEB   SENT YOU A MESSAGE. I DID THIS AND IT WORKED GREA...   Dec 25 2010, 08:22 AM


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