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B4.1 Shocks rebuilding - Shaft goes UP?

B4.1 Shocks rebuilding - Shaft goes UP?

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Old 06-22-2012, 02:11 AM
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Default B4.1 Shocks rebuilding - Shaft goes UP?

Ok so I just rebuilt my front shocks and put 35wt oil in them, followed the manual and when I was done I didnt have rebound, I had pull...

LOL!

Thats gotta be wrong right? I pull the shaft out and then it wants to be sucked back in...

So what did I do wrong and how do I fix?
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Old 06-22-2012, 02:48 AM
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It's not technically broken. Is the other shock the same? Most opt for very little to no rebound in their shocks depending on how smooth the track is.

If both shocks are the same, then run it and be happy. Practice making the amount of rebound identical. Then play with the amount of rebound to see how it affects handling.
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Old 06-22-2012, 02:51 AM
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Originally Posted by t0p_sh0tta View Post
It's not technically broken. Is the other shock the same? Most opt for very little to no rebound in their shocks depending on how smooth the track is.

If both shocks are the same, then run it and be happy. Practice making the amount of rebound identical. Then play with the amount of rebound to see how it affects handling.
There is no rebound, wait...by rebound you mean when I push the shaft all the way up it comes out of the shock some? If so, its not...

When I PULL the shaft OUT of the shock body, it wants to go BACK into the shock body! lol
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Old 06-22-2012, 03:09 AM
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I understand. There's a vacuum. There wasn't enough oil in the shock when you rebuilt it, so now you're getting a vacuum.

It does affect your handling, but not necessarily in a negative way. It's more important that the amount of rebound is equal between the left and right shock.

You can add more oil and re-bleed to get it to 0 or positive rebound.
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Old 06-22-2012, 03:14 AM
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Originally Posted by t0p_sh0tta View Post
I understand. There's a vacuum. There wasn't enough oil in the shock when you rebuilt it, so now you're getting a vacuum.

It does affect your handling, but not necessarily in a negative way. It's more important that the amount of rebound is equal between the left and right shock.

You can add more oil and re-bleed to get it to 0 or positive rebound.
Ok good then Im good. Because they both did the exact same thing!

Once I put the spring on they feel very smooth, so Ill just go with it!
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Old 06-23-2012, 01:24 AM
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Whew! I'm sure glad this was posted. I have to rebuild my rear shocks and need to be aware of things like this.
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Old 06-23-2012, 02:34 AM
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I had this also, but you need to pomp the shocks a few times and then the rebound perfectly
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Old 06-23-2012, 06:47 AM
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Originally Posted by Ironwolf1974 View Post
Ok good then Im good. Because they both did the exact same thing!

Once I put the spring on they feel very smooth, so Ill just go with it!
The fix is to loosen the cap, pull the shaft all the way down (without leaking any oil) and simply tightening the cap. You just have a little negative pressure. Chances are, if you left them alone, sitting at rest the shocks would draw in the tiny bit of air they need to balance out.
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Old 06-23-2012, 06:54 AM
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Originally Posted by Davidka View Post
The fix is to loosen the cap, pull the shaft all the way down (without leaking any oil) and simply tightening the cap. You just have a little negative pressure. Chances are, if you left them alone, sitting at rest the shocks would draw in the tiny bit of air they need to balance out.
I did thus and they work fine now with the 25% rebound that was needed in the setup sheet I was using!
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Old 06-23-2012, 07:51 AM
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Great question. I have another to add along The original question. How do you determine rebound, is by pushing the shaft in and waiting for it to push out or is it pulling on the shaft?
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Old 06-23-2012, 09:47 AM
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Two different types of rebound. Negative rebound means the shock shaft pulls into the body. Possative rebound means it pushes the shock shaft out of the shock. On most setup sheets that list rebound generally mean possitive rebound.
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Old 06-24-2012, 08:08 AM
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Originally Posted by nismomike View Post
Two different types of rebound. Negative rebound means the shock shaft pulls into the body. Possative rebound means it pushes the shock shaft out of the shock. On most setup sheets that list rebound generally mean possitive rebound.
Ok. That makes even more sense now. Thx!
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