Rear suspension sag!!! - HCS Snowmobile Forums

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Old 10-23-2011, 09:01 PM   #1 (permalink)
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Default Rear suspension sag!!!

Was checking on the sled today in storage. Started right up, Check.. Then, pushed down on rear of sled to see how it "feels" compared to my wife's. Hers popped right back up, nice and smooth. Well, mine just didn't. You could pick it up and it would re-set sort of. So, my question to my fellow fusion 600 owners is. What need to be fixed to make the rear suspension work (rebound) like it does on my Wife's sled (07 F5 LXR)

A. new torsion springs.
B. the fox rear shock is shot.
C. All of the above.

Michahicks, I know you must have some advice. You helped me last year with some suspension set up questions. But, being stored all summer you would expect that it would be pop right back up when pushing down on the rear end. It would sag noticeably compared to my wife's and stay there. No leaks around seals of rear fox shock.

Last edited by smrdc1974; 10-23-2011 at 09:07 PM.
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Old 10-23-2011, 09:19 PM   #2 (permalink)
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Rear shock is shot and not allowing it to rebound correctly. Get the the shock rebuilt.
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Old 10-23-2011, 09:52 PM   #3 (permalink)
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Rebuilt or new? Didn't think that model fox could be rebuilt. Obviously what would that cost? And, how much is a new one?
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Old 10-24-2011, 07:42 AM   #4 (permalink)
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The torsion spring carries the load and is what is directly related to the sag. The shock controls the rate of movement. The only way the shock could cause your problem might be if it got stuck when compressed.

Make sure that the skid is sitting level on the ground when checking thist as I've seen some strange things happen if it isn't.
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Old 10-24-2011, 08:57 AM   #5 (permalink)
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Quote:
Originally Posted by smrdc1974 View Post
Rebuilt or new? Didn't think that model fox could be rebuilt. Obviously what would that cost? And, how much is a new one?
All fox shocks are rebuildable.

I had the same issue with the Fox PPS1 shock in my 2000 XCSP. The suspension would sag and would not come back up. This was due to the shock being stuck in the compression mode and it did not have enough energy/force to bring the piston back up. Honestly the PPS shock was a huge POS and I just ended up replacing it with a Kimpex gas shock last season and really didn't notice that much of a difference from when the PPS was in working condition. But your sled is completely different.

It's true that the torsion springs hold the sled up, however the springs will not have enough rebound to overcome a stuck shock. To due this, a spring would have to be so massive that you would never be able to compress it making for a very bouncy ride. The rear suspension works in tandom, all parts need to be functioning for it to work correctly.
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Old 10-24-2011, 09:34 AM   #6 (permalink)
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Thanks 99, that makes sense.... The whole torsion spring and shock combo and how they work... So, to take the shock out, do I just unload the rear and unbolt?
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Old 10-24-2011, 01:28 PM   #7 (permalink)
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Yes, just take the tension off the torsion springs by removing them from the slide blocks and let them hang down and then remove the shock.
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Old 10-24-2011, 02:27 PM   #8 (permalink)
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Quote:
Originally Posted by 99_xc600 View Post
All fox shocks are rebuildable.

I had the same issue with the Fox PPS1 shock in my 2000 XCSP. The suspension would sag and would not come back up. This was due to the shock being stuck in the compression mode and it did not have enough energy/force to bring the piston back up. Honestly the PPS shock was a huge POS and I just ended up replacing it with a Kimpex gas shock last season and really didn't notice that much of a difference from when the PPS was in working condition. But your sled is completely different.

It's true that the torsion springs hold the sled up, however the springs will not have enough rebound to overcome a stuck shock. To due this, a spring would have to be so massive that you would never be able to compress it making for a very bouncy ride. The rear suspension works in tandom, all parts need to be functioning for it to work correctly.
I have an 06 Fuze that just put the 12.5lb torsion springs in and it still has that 2-3 inch sag, or drop if you will, from letting the rear bumber go from it's highest position. Your saying the rear shock needs to be re-juiced? 2300 miles on sled.
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Old 10-24-2011, 02:31 PM   #9 (permalink)
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Current Sled(s): 06 Fusion 600, 07 F5 LXR
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Location: Durham, Maine
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10-11 Mileage: 1200
Age: 38
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Yes, has about 2500 and needs to be re-juiced.... does not rebound what so ever....
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Old 10-24-2011, 05:46 PM   #10 (permalink)
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There was a great thread about this a while back and pretty sure it was Michahicks who started and went into great detail about it. Search is your friend.
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