what rear suspension spring???

ovalracer

ovalracer

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I was wondering if anybody knew if this was a oem yamaha spring for the long travel msrx rear suspension?? I am having trouble getting my 50/50 transfer rod gap. I have the center shock in the position shown, rear shock let all the way loose, fra in middle, limiter straps as shown.

I weigh about 185lbs, and getting about a 80/20 gap. I was thinking that maybe the center spring was a aftermarket spring and was a stiffer rate....?

thanks
 

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if your spring in the rear is adjusted all the way loose and your not getting 50/50 that spring in the rear maybe something other than stock aka "big boy spring", the center looks to be a maxximum 2.8 straight rate, go to axis shocks web site and in the model guide there is calculations to measure this rate using size of coil,winds ect...
Do a search and look at a some photos of rear shocks in skids in the classified, there is about 2 of threads left.....
when i get home tonight i will look up and post the size your stock length spring should be for that sled, your photo looks as though its a short travel rear shock, with a long travel spring? :dunno: ....CP
 
98 msrx did have the 11 inch travel rear. stock rear spring installed length is 372 mm = 14.64 in , limiter strap length 10 mm = .39 in , fra med , center spring stock is a 4.5kg/mm rate....make sure the rear shock is about 18.3 inches eye to eye....CP
 
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if you aren't getting enough gap on the bottom side of the control rod housing you may have to loosen your center spring preload some. It looks like it is plenty tight anyway, especially for a mountain sled.
 
Move the fra to the lightest posistion, not the center, and try it. That looks to be the stiffer Max perf spring in the center shock. you may need to take some preload off of it. Heres the way Tom told me to set mine, and it works great. Lift the rear of the sled so the track is off of the ground, loosen/ tighten the center shock till you are just at zero preload, or where the spring is tight against the adj, but not compressing. You then turn the adjuster 4 turns tighter. You then adjust the rear for your 50/50 gap. maxdlx
 
thanks for the tips guys. I figured it wasnt a oem spring. I got it pretty close right now. I took some pre-load off the shock and put the fra in the soft position. I have about a 60/40 gap now. I want the most transfer i can get......

Also as far as my front end height goes, my front bumper is exactly 15in from the floor to the bottom of the front bumper. Does this sound about right??
 
ok, well i backed off the center spring and turned it 4 turns like paul said. It seems like it is even worse(not getting my gap) I have the center spring like stated above and the rear spring all the way backed off, fra in soft position and still getting only a 80/20 gap.... ???? what the heck is going on!!!???

Could i possibly have to get a softer center spring??? OEM??
 
I have been having the same problem with my longtravel'd SRX, i have the same blue straight rate spring, it came with the longtravel'd set up i got done from MaxxPerformance. I couldn't get a 50/50 gap all last winter. I picked up a stock 2003 dual rate Viper spring and will try that later this month...............James
 
check your shock and spring in the rear and see if you have the dimensions posted....if that spring is a maxximum it is too soft, go with zero preload and work up from there (remember srx front ends are 40 pounds heavier than the sx you had, and a stock 121" srx sleds ran a 5.5 straight rate)....you may even have a binding issue in the shafts of the w-arm and back main rear shaft......CP
 
i will check the shock dimensions... If the center spring was to soft wouldnt the problem be the other way around(adding preload to get the 50/50 rod gap, having to much gap on the bottom of conttol rod). The suspension seems real smooth and dont think anything is binding. I raised the front end of the sled to 16" from the ground to the bottom of the front bumper and that helped a little... thanks for the info CP.
 
80\20 gap would be right if the sled was raised 20% with longer shocks and no modifications to the rods or there plastic shims.
 
i would assume that when yamaha put in the long travel shocks, they changed the length off the rods and the limiter straps....
 
They might of Coldplay has it on the money when he says check lenths.Alot of guys are putting longer shocks at the rear of the sled and are useing the same bars that run beside it.You know the ones that work with the BIG rear shock.They pull the shock when the rear end sqwats down from your *** or a bump.I am not saying you would have to go that route but if you lift the ride hieght of the rear bumper you are pulling on the transfer rods.Removing or putting a thin shim in the very bottom of them will help.The work done on your sled is only as good as the guy doing it.
 
the msrx comes long traveled from yamaha, nothing was changed in t he rear suspension other than a different center spring....I will check the lengths. thanks for the info guys!
 
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do a search on this topic rear skids for sale and look how much thread is exposed on a aluminum rear shock, about 2 inches, your rear spring by your photo looks out all the way to the end??..... :dunno:
 
i have mine that way because my center spring is so stiff that i have to have the rear spring backed all the way off to get he correct rod gap, and still cant get it right. I will mess with it some more this weekend.. thanks guys
 
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