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Icelander
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« on: September 10, 2017, 12:06:25 PM » |
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... on a tire that is using Dynabeads?
I'm running dark with Dynabeads on the rear and no matter where I position the valve stem, I get a bead stuck in the valve and have to completely air-down the tire, remove the valve, clear it, replace, and air-up. I've tried putting the gauge on my air chuck and pumping air into the stem first to try and "blow" the beads away from the valve to no avail. I've even removed a saddlebag so that I can check the pressure at the top of the wheel. Pull the gauge off and I've still got a leak.
It's become such a PITA that I've been very reluctant to check my air pressure without having 15-20 minutes and the equipment to do all the work.
/Icelander
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1998 Valkyrie Tourer.
VRCC Member #36337
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Leathel
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« Reply #1 on: September 10, 2017, 12:18:06 PM » |
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I ran beads on my last bike, never had an issue on that but it had a std stem, the beads did come with 2 new valves but they looked std to me.
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JimC
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« Reply #2 on: September 10, 2017, 01:25:17 PM » |
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When I had beads I always gave the valve one more solid shot of air after getting to within a pound or so of where I wanted it to be. That last shot seemed to clean the schrader valve of beads.
If the last thing you do is check the air pressure, you are letting the beads get blown out of the tire and into the schrader valve as they try to exit the tire with the air, not blowing the beads off of it.
Also, set the valve as high off the bottom of the wheel as possible to keep the beads away as much as you can.
Hope that makes sense.
Jim
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« Last Edit: September 10, 2017, 01:26:54 PM by JimC »
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Jim Callaghan SE Wisconsin
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The emperor has no clothes
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« Reply #3 on: September 10, 2017, 01:41:52 PM » |
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That's odd. I only have had that issue if I checked with the valve at 6 o'clock . With them at 3 or 9 o'clock no issues. When I have gotten a bead stuck, I just gave it a shot of air to clear it. Not let it all out.
The valves that come with the beads that Leathel was talking about won't fit in our 90* stems.
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Icelander
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« Reply #4 on: September 10, 2017, 02:19:30 PM » |
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My first attempt was on the road with the Vermin and I had created a leak because the stem was near 6 o'clock. Cranked the metal valve cap down and it seemed to hold air enough but it was a nagging worry for the entire ride. I've since tried 9/3 o'clock and 12 o'clock and still get a leak. I've pulled the air chuck off while pressurizing and still get a leak. Maybe the beads are too small/light?
It's frustrating. I can't just check the pressure before I ride, I have to be ready to pull the valve.
/Icelander
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1998 Valkyrie Tourer.
VRCC Member #36337
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N8171S
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« Reply #5 on: September 10, 2017, 02:30:12 PM » |
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Never had an issue but my first batch of beads came with valve guts with filters built in to prevent issues. The guts wouldn't fit standard stems so they are probably floating around in the garage.
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gordonv
Member
Posts: 5760
VRCC # 31419
Richmond BC
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« Reply #6 on: September 10, 2017, 03:20:53 PM » |
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I'm thinking you have a different problem. I'm currently running beads, 0.8 mm, same size as Dyna are. Using 90' metal stems. I can't see how this would even be a problem at 6'oc since the beads should be at the bottom of the tire, not up where the rim is. I'm wondering if there is some static electricity that is allowing the beads to "float" up near the stem, or some "oil/grease" letting beads stick to the stem, and when are flows out, allows a bead to go with it. They are light, and do float in the plastic bag I store them in, so static makes more sense to me. What kind of tire gauge? I use a screw on type, never a press on. I used a press on, and pressed so hard, I broke the support stem, because I couldn't believe the pressure was that low, and thought I was getting a bad seal (I wasn't  ). |
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1999 Black with custom paint IS   |
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Ken Tarver
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« Reply #7 on: September 10, 2017, 05:14:07 PM » |
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Change to Counteract Balancing beads
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MarkT
Member
Posts: 5196
VRCC #437 "Form follows Function"
Colorado Front Range - elevation 2.005 km
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« Reply #8 on: September 11, 2017, 03:33:51 PM » |
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Ride-On has no such problems.
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Danny McMillin
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« Reply #9 on: September 11, 2017, 06:13:07 PM » |
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Buy the valve stems with stainless steel screens! One dollar each! Check pressure anywhere but 6 o'clock!!
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The emperor has no clothes
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« Reply #10 on: September 11, 2017, 07:48:14 PM » |
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Buy the valve stems with stainless steel screens! One dollar each! Check pressure anywhere but 6 o'clock!!
I haven't seen those. Where do you get them ? |
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h13man
Member
Posts: 1751
To everything there is an exception.
Indiana NW Central Flatlands
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« Reply #11 on: September 13, 2017, 07:03:07 AM » |
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Check mine at 10 o'clock position. Screened valve core inserts didn't fit my 90 degree stems but have no issues with fills.
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old2soon
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« Reply #12 on: September 13, 2017, 09:07:39 AM » |
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Ride-On has no such problems.
Nor do the BBs I'm currently using for a balance media.  RIDE SAFE. |
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Today is the tommorow you worried about yesterday. If at first you don't succeed screw it-save it for nite check. 1964 1968 U S Navy. Two cruises off Nam.
VRCCDS0240 2012 GL1800 Gold Wing Motor Trike conversion
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BINOVC
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« Reply #13 on: September 13, 2017, 02:03:54 PM » |
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I'm also wondering how beads can get into the valve...
As gordonv says, "I can't see how this would even be a problem at 6'oc since the beads should be at the bottom of the tire, not up where the rim is."
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The emperor has no clothes
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« Reply #14 on: September 13, 2017, 02:29:37 PM » |
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I'm also wondering how beads can get into the valve...
As gordonv says, "I can't see how this would even be a problem at 6'oc since the beads should be at the bottom of the tire, not up where the rim is."
The individual beads are pretty light. With the vacuum created when air is released checking your pressure, they can get sucked up in the valve. |
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