[dejock]

Hey all,

Have a Manitou Minute 29 80mm fork and was trying to add a little more air to reduce sag. My shock pump will successfully put air into the fork, but when I try and unscrew the pump, it lets all the air right back out :madman: . Is my pump bad, or is this a bigger problem with my fork?

Any insight is appreciated. Thanks

 

[SmilMick]

ALL of the air? Or just a little puff of air?

If its just a little puff of air, thats normal. Its just from the pressure that was trapped within the gauge and hose of your pump. Yes, when you screw on the shock pump, it will read less pressure than you put in a minute ago, but thats because your pump requires air to actually give you a reading. So no matter what, whenever you screw on your shock pump, it rob some air from your shock so that it can give you a reading. On average, when you screw a shock pump on, it will read 5psi less than what you really had. Rest assured, if you pump up your shock to 150psi, and you remove the pump and hear that little puff of air, I PROMISE there is still 150psi in your shock!! That little puff of air wasnt from the shock! Its from the Pump! But as soon as you hook up that shock pump again it will read something like 145psi! (this topic gets brought up like every week)

If it really is letting ALL of your air out of your fork, then yea, something more serious is wrong.

 

[dejock]

ALL of the air. Because when I screw the pump back on, the gauge reads 0 psi. Its almost like I cannot unscrew the pump fast enough and it lets all the air out before I can remove the pump from the fork. So, yeah, I'll try a different pump later to hopefully rule out a fork problem.

Any other advice? Anyone with this fork experience this issue?

 

[joh]

I've had this happen before. In my case, the valve core (the pin) on the shock was a little far out. As a result, when unscrewing the pump, the pin on the schrader valve was still depressed, and the shock would lose all of its air.

Screwing the valve core in a couple of turns with a schrader valve core tool ($3 at an auto parts store) did the trick.

 

[brad72]

My pump lets out about 5-10psi if i din't unscrew in a certain way. What i do it push the hose towards the valve and unscrew the plug as quickly as possible whilst still pushing the hose. This seems to stop me loosing air from the shock