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The sled is a 2000 Yamaha venture.

If not following my journey, the short summary is that I noticed cracked skid rails after buying and so I replaced the entire skid. In the process and to prevent this from happening again, I also changed the shocks and these are the original coil springs put onto Kimpex cheap gas shocks.

Both the front and back shock behaved the same when tested out of the sled, very hard to compress and slow to rebound. Figured that's what they're supposed to behave like? But never done this before so unsure.

The previous owner had the coil springs cranked almost all the way down, and so I left them both relatively loose 3/4 of the way out.

Skid went back into the sled and immediately noticed it's much more compressed with even just the weight of the sled. When I lift the back to get it on the dolly it will sit higher like this picture shows:



But if I put any weight on it it will collapse down to this point here and not go back up to fully extended as in the first picture.



I have to take the skid out again anyways because I forgot a washer behind the front W arm bushing and so I might as well solve whatever is going on here.

From my complete inexperience I'm thinking along the lines of a) the original coil springs are completely fatigued and/or B) 3/4 of the way out is way too loose and the spring isn't giving enough resistance to support the weight on it

Thanks again for all the help guys - it's been an ADventure lol!
 

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I would guess it is not tight enough. Always thought that was a weird design by Yamaha vs Polaris and others who did their rear suspension springs separate from the shocks until in the 2000s sometime. The Front Rear shock had one but it was always the rear that supported the majority of the weight. I would try readjusting and if that don't work find an aftermarket replacement if possible. Either way I will bet your ride is going to improve over those hydraulic shocks that were on there. Going to gas shocks is always a decent improvement and they will last a lot longer and take more abuse.
 
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