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Another std RZR rear spring/shock option...

20K views 38 replies 10 participants last post by  PolarMud  
#1 · (Edited)
As I had mentioned in this LTR450/YZ125 shock thread.....

http://www.rzrforums.net/suspension/51218-part-2-ltr450-yz125-shocks-std-rzr-45.html

I was planing on using DS450 KYB front shocks in the rear of the RZR. They are a close match to the stock rear RZR springs eye to eye, being 18.5-19.5 depending on model DS450 or DS450x. They are fully adjustable, preload, rebound and compression. The x shocks have both low and high speed compression as well. Since I plan on the LTR450 shocks in the front, I went with the DS450x shocks for the rear. This should give me the added height needed to match the fronts when intalled. Also, the shock mounts are a perfect fit for the RZR brackets. Not requiring spacers, you could use them if you needed, but the RZR brackets flex nicely.

REAR OEM Polaris No: 814902001183 Mfr: Sachs/Mexico

RZR factory rear shock/spring info.
Length eye-to-eye: 12.57"/ 18.5".................6 inch stroke
Bushing: 13/32 (10mm) ID, 5/8 OD, 1 3/16 long
Spring preload (lowest setting): 220 Lbs.
Spring Rate: 170 Lbs per Inch
Spring Free Length: 13.5", 8.5 free coils, Installed Length: 12.125"
Preload adjuster range: .625"

It was mentioned in the other thread that the spring rate on the DS450 might be too low and after research and fitting, he was right. The DS spring rates vary. Some of them stock are 100/175, some are softer in the range of 80/150. I wanted to use the factory RZR rear springs, but they are too wide to fit with the KYB piggyback reservoirs.

So....
Some of us Honda TRX700XX owners put the DS450 shocks on the front of our 700s. The superb KYB shocks allowed us to use the taller, but lower spring rate shocks with wonderfull results. So I had a set of TRX700xx springs laying around.

The TRX700xx front spring rate is linear and far stiffer than the DS450 shocks and are anywhere from 160 to 200#, while the std rzr rears are 170 Lbs per Inch. They fit pretty well, and are as stiff as the factory units. Plus they appear to give the ride height needed to make this all work. TRX700 spring should be cheap over at Club700XX.com :: Your #1 Honda TRX700XX Online Resource! as many of us aren't using them anymore. Also, the DS450 shocks can be found for around $130-$150 shipped.

It may not be the perfect combo, but I believe the DS450 KYB shocks are superior to the YZ125 shocks. And if the springs turn out to be to stiff or short, springs can be ordered with the proper length/spring rate for decent prices. But as it stands with zero preload on the TRX springs it sits level with the stock shock/springs at max preload. Should have the LTR450 fronts on next weekend, and tested out on the local track before our big Memorial weekend trip.

Here are the pics with the DS450 shocks with TRX700XX springs.
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Adjusting the DS450x shocks....
The compression is adjusted up at the piggyback reservoir. The low speed is done with the flat head screw in the middle, and the high speed is done with the hex, I believe it is a 17 mm. The rebound is of course down at the bottom of the shock and is done with a flat head screw.
The factory setting for low speed compression is all the way in and then 8 clicks out.
The factory setting for high speed compression is all the way in and then 3/4 of a turn out.
The factory setting for rebound is all the way in and then 9 clicks out.

Hope this helps someone.

Mav
 
#3 ·
Springs are cheap and easy to find. The 700xx ones expecially. There is no CV bind as it is at stock height now and feel I could run a 2" lift if I needed too even if I up the preload a bit.

And I feel the YZ springs are way to stiff for anything other than racing. Which is another reason I went with the 700xx spring.

Mav
 
#4 ·
Keep us updated. Just want to let you know, I just ordered a set of DS450 front shocks off of Ebay for $240 (they are like new). I'm getting the 700xx springs next. Your idea is one of the best I've seen yet. Very good post and Thanks!
 
#5 ·
PolarMud, I will keep you posted. I have to go out of town tomorrow, but I will install the front springs before the weekend, then hit the local track to see how it all pans out.

Mav
 
#6 · (Edited)
Update.....

Installed the LTR450 front shocks tonight. Pretty easy and straight foward install. I have about 3/4" of preload on them and the front end sits at 12.25" at the low point. With the rear DS450 shocks set with 3/4" of preload the rear low point sits at 11.5". From reading on here, the front should be about 1/2" higher. I may have to lessen the front preload to get this down a tad. From riding it around on the street here, all seems fine. I will use our long Memorial weekend trip to dial the shock settings in. Should be pretty cool. I have the front sway bar off now, but not sure I like the sway as much. Maybe the shocks will settle that down a bit too. After talking with a shock expert, he likes the setup and says it was a good choice. The 700xx springs aren't perfect as preload takes out the dual rate protion of the shock. But should still be better than factory by a hugh margen. I have $280 in these shocks and springs so I'm ahead already. Here are a few pics.

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#9 ·
Keep us posted. My ds450 shocks came in the other day. Now I'm just waiting on the 700xx springs. I will probably end up copy catting you on the whole setup. Glad you posted all this info and pics. You ought to get paid for this one!
 
#10 ·
Just got lucky following some of the other guys like Dr. Honda. Thanks for all the help with the other setups/info guys.

Just happen to have some experience with the DS/TRX setup and figured it might work. I will know for sure next weekend.

Mav
 
#11 ·
Hey are the Honda 450r and 400ex front shocks the same dimension wise. I hear the 450r shocks will work on the front of the RZR. I think the reservoir thing may get in the way though. but I've seen some aftermarket ones on Ebay without the reservoirs.
 
#14 ·
I put a set of front DS450xmx springs on a TRX450r front shock this weekend with outstanding results. This tells me that the TRX700 spings=DS450xmx shocks=TRX450 shocks. Should work size wise.

Mav
 
#15 ·
Update on the DS450 rear shock/LTR450 front shock setup.

Took to the trails this weekend. Put about 300 miles on the setup(son and I). Overall impression...

- Both LTR and DS shocks are much better at control than the stock setup. I feel(as set) that the DS450xmx shock is a MUCH better shock than the LTR shocks. I think I will have to loosen the preload on both front and rear to soften the setup a bit for the trails. Both the TRX700 and LTR450 springs feel as stiff as or a bit more stiff than the stock 50" springs. Not a bad thing, but I was looking for a Cadillac ride and didn't get it yet. I think with a little less preload and some more compression tunning and we are there. Lessing the preload will lower the unit though and I don't want that. Maybe a lift, or just ride as best we can because as it sits, this is a jumping/whoopty-do machine. Can't wait to get it to the dunes to see what it can do over the stock setup. On the trails it jumps with control and lands like its on a cushion of air. I think alot of that is leveled on the super rear shock and spring setup. I did remove the front swaybar, and it made a big difference on the rock crawling aspect. I think the rear will stay on as my son drives this unit mostly. Here are a few pics.

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Mav
 
#16 ·
thanks for the info again. Where's a good place to start on the rebound and compression settings on the rear shocks (ds450). This is where I got a little learning to do. I want mine setup for a plush ride cause I'm riding in the mountains of WV(rocky) for 8 to 10 hrs a day. I'm not into all of the jumping, and ripping it up stuff.
 
#18 ·
I would start with the preload as soft as you can set it, and begin with all setings in the middle and work your way up in stiffness, or more likely down in stiffness for your liking.

Mav
 
#19 ·
Slight update.....

Just put a Racertech 2" lift on last night. No CV bind at full droop. Very happy with that, but only got about 3/4"-1" lift out of the kit. The shocks gave 1-1.5" to begin with. Gonna run them hard this week on the Alpine Loop. Will report after.

Mav
 
#22 ·
Hey I put the ds450 shocks w/700xx springs on my RZR. However I have not got my LTR450 shocks put on the front. I tried something a little different on the front shocks. I took the OEM springs that came on the DS450 shocks and put them on the crappy stock RZR front shocks. Believe it or not it helps it ride much better, but the front end ride height is still too low for my style of riding, even with the preload cranked to the max. As for as the DS450/700xx shock/spring on the rear, It is a major improvement over the stock setup and is worth every bit of what you pay for shocks and springs ($250 to $350 Ebay price) The ride is a lot smoother and not as bouncey as the stock setup. However, MadMav is correct, the ride height is still an issue. As it needs 1.5 to 2 inches of lift all the way around. I think the 700xx springs are just a tad too soft for my style of riding. I think it could use an additional 20lbs of spring rate. I will probably put a Racertech lift on mine eventually after I get my LTR450 shocks.
Very good post and thanks again for all the info MadMav. Shoot us some pics of your RZR with the lift if its no trouble.
 
#23 ·
Yeah, the DS450 springs are too weak for the RZR weight.

Not sure what you mean by the ride height is an issue. I don't have any issues as the LTr and DS shocks make a good even lift once the preloads are set where you want them.

I will get some pics and post them up when I get a chance this week.

Mav
 
#24 ·
Ive been watching this for awhile now. I was intrigued with the DS/700 combo. So I swapped out the rear set on a rzr570. They fit grand, and give about 1 inch of lift. the caveat is that you must disconnect the sway bar. There is no room for the N2 can with the sway bar in place.

A couple of rides later and I am very pleased with the results. a little added sway, but the rears are much better planted, and the ride much more civil.

Thanks guys
 
#30 ·
Has anyone tried to see if super atv's heavy duty springs will fit these shocks, i have this set up on the back of my rzr 570, but the 700xx springs are to soft for the rzrs weight. Also im running the ds450 xmx shocks which are a bit longer, I havent had much luck finding a good replacement spring
 
#32 · (Edited)
If you.cant find a set of TRX700 springs contact any spring manufacture and see what they can build for you. Good luck. I bet if you check the spring dimensions and talk with super atv, they can let you order some with the spring rate you desire.

Mav