Rear of sled severe sag...... Pls help

[Sledroll]

If you putting on more than 3000km a year , I would recommend you rebuild your rear of rear shock with a nitrogen charge of 200 -215 psig with it done right before the season starts for best results. Most of the sagging problems will be fixed .

I thought it was the spring that affected the sag , and not the shock .
I had my shock rebuilt and it didn't make a difference .

 

[Yamajon1]

I thought it was the spring that affected the sag , and not the shock .
I had my shock rebuilt and it didn't make a difference .

That’s correct shocks dampen and control the springs motion. They don’t hold the sled up. The springs are what hold the machine up.

 

[cannondale27]

That’s correct shocks dampen and control the springs motion. They don’t hold the sled up. The springs are what hold the machine up.

Yes and geometry. Shock pressure has very little effect on sag. Some suspensions on sleds are designed to have a lot more sag than others.

 

[cannondale27]

Maybe they just got it wrong. Didn’t account for springs that sag out eventually after use. Or springs are just junk. I can understand a 350 # guy or fully loaded sled needing new springs this soon but otherwise adjustment should be enough. That said I have the Phazer setup to sag all the way to coupler blocks and it still rides excellent. The SkiDoo r motions are same thing. They have a huge amount of rider sag. I am hearing the complaints about the sag but what should really matter is does it ride good? Does it?

 

[hellflyer]

Ther is definitely a spring issue! Me at 280 and 40lbs of travel gear on setting #2 and still sits pretty high.

 

[cannondale27]

Ther is definitely a spring issue! Me at 280 and 40lbs of travel gear on setting #2 and still sits pretty high.

As long as the geometry on yours is the same as these others with issues I 100% agree but I would want to check springs and compare entire skid geometry before coming to any conclusion. Cat makes changes mid run and it would also not surprise me to see mismatched or old parts being used up. For instance using the old skid in a sled with the new spindles would do exactly as described.

 

[hellflyer]

Very true! Hard to really tell with out them side by side and some measuring.

 

[ClutchMaster]

Check for a busted spring, my front track shock spring broke at around 5k miles.

All springs take an initial set then usually don’t fatigue much after that. That said the factory springs or almost any springs nowadays are made in China...... nuf said

 

[ClutchMaster]

China is famous for inconsistent heat treating and improper amounts of alloy in alloy steel.

Basically if the quality can’t be seen with the naked eye they don’t give a rats a$$.

 

[Mototown]

I thought it was the spring that affected the sag , and not the shock .
I had my shock rebuilt and it didn't make a difference .

I can tell right away when the nitrogen is low on my sled , with the sled set up for my weight , there is 1-2 inches of sag by itself. When the shock is low , push down on sled it will be 3-4 inches down and won't return to 1-2 sag ( needs rebuilding) . Then also when coming out of corners accelerating it will bottom very easily when the nitrogen / oil needs rebuilding.
That is the sag I'm talking about , if you are over weight for spring or spring is broken that's clearly obvious from rider on it . Or if you put a link gas can on you will need heavier springs.
Yes the nitrogen charge has effect on ride height , blow off the nitrogen in sled push down record height, rebuild shock install push down on sled record height I will tell you now there will be a height difference, unless your springs top out by themselves with no sag on the bike or sled you testing . ( dirt bikes are very easy to prove that nitrogen effects ride height)

 

[ClutchMaster]

I agree that if the nitrogen is low, yes it will affect ride height. As it usually happens over a longer period of time it can be hard to detect until it becomes really bad.

A broken spring isn’t always obvious when riding, I didn’t find out mine was broken until I had the sled lifted in the air. If it breaks in the middle yes obvious, but if it breaks just one coil down from either end it’s hardly noticeable.

All that said, if your out riding and notice your sled seems lower than usual, check for ice build up in the tunnel. Seen it before where there was probably 75 extra pounds of ice/snow under my machine after a good flogging.

 

[Tuckerlee1]

Maybe they just got it wrong. Didn’t account for springs that sag out eventually after use. Or springs are just junk. I can understand a 350 # guy or fully loaded sled needing new springs this soon but otherwise adjustment should be enough. That said I have the Phazer setup to sag all the way to coupler blocks and it still rides excellent. The SkiDoo r motions are same thing. They have a huge amount of rider sag. I am hearing the complaints about the sag but what should really matter is does it ride good? Does it?

 

[Tuckerlee1]

 

[cannondale27]

View attachment 156448

And? Are you thinking they put srx springs in some? Possible.

 

[Tuckerlee1]

I hope this helps they may have set up the 2020 LTX sled with the same lower rate coil springs For a ride height if you read the above article

And? Are you thinking they put srx springs in some? Possible.

there is just to many people and until the year ends and Yamaha puts out bulitings on how many people complained and brought there sled s back to the shop for repairs we will find out I think you are the most knowledgeable person on this site and it seams by looking threw your post you have a lot of experience and input on suspensions nice job hats of to you thanks for your post because I’ ride faithfully every year end I am still learning about suspensions so thanks for input