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.
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
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.


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