Rear suspension help for 230+

[Boston Racing]

I am 230 with riding gear on a 2007 RMK 600 with a 155 track. I have new torsion spring adjusters that go 1 position stiffer but it still seems like the sled sags alot and bottoms out. My front track shock is in the layed down position and the limiter straps are all the way out. What settings are all the bigger folks using. I ordered the Carls heavy duty front track spring but it looks like that fix was designed for the non-raw chassis. Is this correct? If I need new torsions in the rear can somebody please post the part number, I am having trouble finding them. I dont want to throwing money at this thing and any help is apprecciated.

 

[sledneck_03]

yep you need big boy torsion springs, im not sure on the part number, i want them aswell. im 255

 

[Cumminsnorth]

7041942-067 SPRING-TORS.375SQ/77°,LH,BLK
7041943-067 SPRING-TORS.375SQ/77°,RH,BLK

I believe these are what you are looking for (09 800 155) I well probably need them also since I'm 245lbs.

These are the stock ones
7041629-067 SPRG-TORSION.359SQ/77°LH,ECOA
7041630-067 SPRG-TORSION.359SQ/77°RH,ECOA

 

[skibreeze]

Here's some reading for ya,

http://snowest.com/forum/showthread.php?t=165462

 

[MORSNO]

I'm a 230# rider also (dry weight) and am currently running the heavy duty 375/77 springs that Cumminsnorth mentioned. They are a big improvement over the stockers made for a "little guy". If I was going to replace my springs again I would use Mountainhorses recomendation to run 47 degree spring. He said that they would feel more like a progressive spring and are made for our IQ chassis. The 405's are not made for our skids so stay away from those...yes I know they will fit, but not correctly.

Part numbers
7042079-067 Spring, Torsion, LH, STD [.375/47 °]
7042080-067 Spring, Torsion, RH, STD [.375/47 °]

 

[Boston Racing]

I went with the 375/77 as I am not actually 230 but closer to 210 and dropping. I normally am around 185 but had a back injury and put on a few pounds. I figured the 375 would be better all around and be much better as I get back to my "normal" weight. Did you also do the #225 front track spring? I was a little hesitant about the 375/47 just for the simple fact a 300lb guy just did it and said it seems too stiff. I dont want that either. Worst case is I spent $140 on springs that will still be a little better than what I have now. Thanks guys for the help

 

[ElectroTech]

If your shock is layed down and the limiter all the way out you are softening the shock and increasing the approach angle, stand the shock up, put the limiter in the middle. Perhaps a 150 pounder needs the limiter let out for deep snow but I bet you run around with your skis to the sky all the time not much point having a 155 if you only put the same amount of track on the snow as a 121. Go with the .375s, stand the shock up and pull in the limiter. As for the springs order the kit, which includes 2 springs and runs $120, just look in an older say 2006 accessories book and they are in there, they dont list them anymore because they'd rather sell you individuals.

 

[Boston Racing]

The reason the shock is layed down and the limiter out is because I read a couple years ago it would trench and not get on top of the snow. I am going to put it back. I admit I changed alot of stuff based off what I read and still dont understand well how it all ties together. This is the setup I will start the year off with please let me know if I am screwing something up

07 RMK 600 with a 155 track
220 Pound rider with gear,under seat tunnel bag,2.5 gas can and another storage bag on the tunnel

Front track shock in the upright position with a carls #225 spring
Limiter in middle position
375/77 Torsion Springs

Once again thanks for all the help.

 

[ElectroTech]

Not sure on the rate of the stock front track spring, you may end up laying it down if its too stiff, if it starts to porpoise off of moguls its a safe bet its too stiff. I know that the 225 was for the 900s mainly to make the front end feel lighter and reduce steering effort, the 07 and newer sleds do not have this problem.

 

[Boston Racing]

I think I leave off the 225 at first then. I never had a problem with the weight of the steering.