I have started running a tubeless set-up for my carbon rims and found that whenever I need to pump up the tyres, the valve is stuck and wont undo due to being clogged with sealant. I end up having to take the valve core out and open and close the valve a few times to loosen it off, and then it is fine.
Is this a common problem? or a sign that I have to much sealant in the wheels?
Can happen in many setups. Sealant level may influence it
Also, I try to only inflate when the valve stem is on the top half of the wheel. I seem to get more contamination if I fill with the stem low.
It happens. Like others have said, to minimize gunk accumulation going forward, rotate to 3 or 9 o’clock position, wait if possible, let some air out with your finger, then add air.
In addition to the other tips, a straight pick or tooth pick if your valve isn’t too long can easily unclog a valve tube once you have the core unscrewed.
I prepped my MTB today for the upcoming season. One of the things I do is redo the tubeless tires - remove the tires, clean them out, check rim tape, add new sealant, etc.
I also check the valve cores for dried sealant. I’ve found that WD40 and a pin allows me to clean out the dried sealant stuck in the valve core. Restores the valve cores to almost like new.
Course you could also buy a new valve core, but that’s cheating