El Nino Posted April 12, 2011 Share I know the manual says that you need to check your pressures on your forks before every ride but how come when I pump up my forks the previous night I have lost pressure the next morning? Especially on the negative side where I lose upto 20 psi. Is there something wrong with the fork or is this normal? Link to comment Share on other sites More sharing options...
Sawdust Posted April 12, 2011 Share That's not normal. I check mine maybe every 6months or so. Unscrew the valve core and replace it with a core from an old tube. Might be some dirt around the seal. Link to comment Share on other sites More sharing options...
patham Posted April 12, 2011 Share The one factor might be your shock pump fitting engaging the air release pin in the valve. I know on my Manitou I lose 20 psi each time I connect & disconnect the shock pump to the valve. So If I want to pump it to 180psi, I pump to 200, and then accept the loss of pressure on the disconnect. Funny enough this is also only on my negative valve, the positive is fine. Link to comment Share on other sites More sharing options...
The Drongo Posted April 12, 2011 Share I know the manual says that you need to check your pressures on your forks before every ride but how come when I pump up my forks the previous night I have lost pressure the next morning? Especially on the negative side where I lose upto 20 psi. Is there something wrong with the fork or is this normal? How old is the fork, and how many K's has it done? Link to comment Share on other sites More sharing options...
El Nino Posted April 12, 2011 Share How old is the fork, and how many K's has it done? 8 months Link to comment Share on other sites More sharing options...
jannosmit Posted April 12, 2011 Share That's not normal. I check mine maybe every 6months or so. Unscrew the valve core and replace it with a core from an old tube. Might be some dirt around the seal. +1 core could be loose or seal not doing its job. What happened to me before is that when you unscrew the pump, you lose a lot of air (crappy pump). It had a bigger effect on the negative because the chamber is much smaller than the positive air chamber Link to comment Share on other sites More sharing options...
Johan Bornman Posted April 12, 2011 Share Your fork needs its O-rings replaced. Common problem. It is almost never the valve. Link to comment Share on other sites More sharing options...
El Nino Posted April 15, 2011 Share +1 core could be loose or seal not doing its job. What happened to me before is that when you unscrew the pump, you lose a lot of air (crappy pump). It had a bigger effect on the negative because the chamber is much smaller than the positive air chamberYep, I did some testing today. I lose air when I unscrew the pump. It's the pump I got with the fork. Anyone recommend a good pump? Link to comment Share on other sites More sharing options...
Nobody Posted April 17, 2011 Share Try borrow a pump before you buy one. It might be the seals or valve core as most pumps sound like they letting air out when you unscrew them. Link to comment Share on other sites More sharing options...
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