JMM

I am restoring a 1990 Jag AFS. All the springs, bushings, wheels etc look to be in good condition. I have greased all the fittings. When I compress the back of the sled it stays down. When I pick it up the track will drop back into position. I am assuming I need a new shock? The shock is a cartridge only, no coil spring. Thanks.

wornknobby

yea, sounds like your rear shock is blown.

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JMM

Thats what I figured. I just ordered a Kimpex Gold, hopefully thats the ticket.

rgoers

Wait, when you push it, it stays down? That would be the spring, wouldn't it??? The shock just provides damping, not rebound. If the spring is broken or missing, it would not return the skid to it's "home" position. The shock just damps the travel.

I usually test shocks by compressing the skid (stand on the seat?) and then releasing (jumping off suddenly). If the skid slams back up, the shock is shot. If it glides back up, it's good. Same on the down stroke. If it goes down too easily, the shock is bad.

From your description, I'd say spring, not shock. and I realize you said the shock does not have a coil spring on it. There should be other springs in the back that keep the skid "sprung" for lack of a better word.

__________________
2000 ZL 550 (Solar Flare, #045/1000)
2000 440 Panther
1980 Jag 3000 F/C

"If it ain't broke, take it apart and find out why!"

Member: Canaltown Snowmobilers Inc.

JMM

Maybe both shock and spring? When I push down it goes down pretty easy and STAYS there. The sleds (I have two of the same) both do this. They have 1000 miles each. The springs look ok, I'll have to look closer. I am familiar with motorcycles and coil over shock, but this spring with seperate damper is strange.

sesnopro

You are probly right, hyd shox work differently than gas. in newer shoxs gas rebounds, in older suspension(hyd) the shox was just a dampener for the springs.

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rgoers

The shock looks to be hydraulic, which means it does NOT rebound on its own. The springs (#7) are what provide the rebound. The adjuster blocks (#22) adjust the tension on the springs.

Hope that helps.

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__________________
2000 ZL 550 (Solar Flare, #045/1000)
2000 440 Panther
1980 Jag 3000 F/C

"If it ain't broke, take it apart and find out why!"

Member: Canaltown Snowmobilers Inc.

JMM

Yes that helps. It seems to working better after some light riding. I noticed if the sled is level (skis and track all on the floor) it seems to work ok. If the skis are up on the dolly and the track on the floor it seems to compress and not rebound. When done riding the back is iin the up position, so I guess thats ok.