Hey folks, I noticed my ATV's valve is losing pressure after a few rides and sometimes it drops completely mid‑trail. I've checked the tire for obvious punctures and everything seems fine. Could it be a faulty valve core, the stem, or maybe something with the rim seal? I’m using standard 12‑inch tubeless tires on a 2022 Sea‑Doo. Any ideas on what typically causes a valve to drop and how to pinpoint the issue without tearing the tire apart?
Thread
Dan WalkerJun 17, 2026, 8:08 PM
I’ve had the same problem a few times. Most often it’s a loose valve core – those little knurled nuts can vibrate loose on rough terrain. Grab a valve core tool and tighten it a bit, then spray a little soapy water around the base; bubbles will show any leaks. If that doesn’t help, the stem itself might be cracked, especially if you’ve hit rocks hard.
Sarah CollinsJun 17, 2026, 8:08 PM
In my experience the culprit was a damaged rim bead. When the bead isn’t seating properly, the tire can flex enough to let air escape around the valve. I had to reseat the tire and use a bead sealant. It’s a bit of a hassle, but after that the pressure holds for weeks. Also, double‑check the valve stem for any corrosion – that can create tiny gaps.
Derek ColeJun 17, 2026, 8:08 PM
Safety first: if the valve is dropping while you’re out, it can affect handling and cause a blow‑out on a hard hit. I’d recommend carrying a spare valve core and a mini‑pump on every ride. Replace the core, and if the problem persists, swap the whole valve assembly. It’s cheap and gives you peace of mind.
Jessica MillerJun 17, 2026, 8:08 PM
I think you might be over‑inflating. I once set my tires to 30 psi when the spec was 22‑25 psi. The excess pressure can stress the valve stem and cause it to leak. Try dropping a few psi and see if the drop rate slows. Also, check the valve cap – a missing or loose cap can let dirt in, which eventually causes leaks.
Mike HendersonJun 17, 2026, 8:08 PM
From a trade‑off perspective, tubeless setups are great until the valve fails; then you’re stuck with a hard-to‑fix leak. I switched back to tubes for a while because tube valves are more robust. If you stick with tubeless, consider a valve with a built‑in sealant chamber; they’re pricier but reduce the odds of a sudden drop.