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Post by wutzthedeal on Jun 2, 2014 6:02:39 GMT -5
How long will Seal-All hold a cracked valve stem, any idea?
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Post by Deleted on Jun 2, 2014 9:45:56 GMT -5
If the valve stem is that bad replace it. I would want a tire going instantly flat from a cracked valve stem at any speed.  . |
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Post by wutzthedeal on Jun 2, 2014 11:08:31 GMT -5
I already ordered two, one for each tire but it could be a few days. It's holding pressure... just wondering about the chemistry. It's broken down by where the fat nub is (the recess, where half goes inside and half goes outside the tire). It was a slow leak, to the point where yesterday I felt this shiftiniess. Thought my meds were messing with me or something, found out the pressure was down to about 20psi. Just wondering how long it would/should hold. I'm not above jb kwik either til the valves stems come in.
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Post by rockynv on Jun 2, 2014 11:51:21 GMT -5
Long enough for you to hurt yourself. If the stem is rotten then replace it before you ride the bike again. There should be plenty of local shops with quality valve stems in stock at reasonable prices.
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Post by oldchopperguy on Jun 2, 2014 13:00:27 GMT -5
It might (I emphasize MIGHT) hold for some time. But I would NOT trust it. I used it on my old Xingyue 150 figuring it would stand up as well, or better than the original AWFUL Chinese factory stems. It did, and I (foolishly) rode for 4 years until constant reports of valve-stem failures and accompanying crashes prompted me to inspect the BRASS fitting that PROTRUDES from the rotten rubber.
THAT IS THE BIG PROBLEM...
With little effort, I pulled the metal part from the rubber part with an EXPLOSIVE release of air-pressure. I don't even want to consider THAT event at ANY speed.
It's true, the rubber CAN crack and pop out of the rim, but it's more likely that the metal stem will blow out of the rotten rubber. NOTHING holds the metal into the rubber... No grooves, and it's not even glued. VERY bad design.
In my case, the glue was MUCH more durable than the factory rubber... But DO NOT trust it at all. It's like trusting a broken safety on a firearm. You can easily install good new stems by simply squeezing the tire with wood slats and a BIG "C-clamp". You don't even need to pull the wheels or tires off the scooter.
The only riding I'd do with the glued stems would be slowly to the auto-parts store, to buy some good stainless bolt-through performance stems. Easy to install, and "bullet-proof".
RIDE SAFE!
Leo in Texas
PS: For all the gun-folks out there, I do know... Don't ever trust ANY safety on a firearm to replace safe handling... I only used that as an example of what might be in store when riding with factory Chinese valve-stems... |
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Post by dollartwentyfive on Jun 6, 2014 13:58:34 GMT -5
i guess the answer would depend on how big the engine is.
for true mopeds and speeds less than about 35MPH a sealant probably wouldn't hurt.
if however you have 150 or above then the safest course would be to replace them.
don't forget, you only have 2 wheels, not 4.
a blowout at highway speeds can be disastrous.
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Post by earlylight160 on Jun 6, 2014 18:27:25 GMT -5
Even at 20 MPH, sudden total deflation could end your riding career. If you have ever seen it happen, it is not a pretty site. REPLACE IT BEFORE YOU RIDE AGAIN
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Post by rockynv on Jun 7, 2014 6:46:28 GMT -5
i guess the answer would depend on how big the engine is. for true mopeds and speeds less than about 35MPH a sealant probably wouldn't hurt. if however you have 150 or above then the safest course would be to replace them. don't forget, you only have 2 wheels, not 4. a blowout at highway speeds can be disastrous. A sub 20 mph off of a rider I know well who was wearing an open face helmet (I will mention him from time to time) ended up with him waking up some weeks later in intensive care with broken ribs, jaw, arm, leg, shoulder, cracked vertibrae, various abrasions and one foot split between the toes all the way to the shin bone. It is a few years later now and he still has not fully recovered after multiple surgeries and many months in rehab centers. It was almost 3 months after he got out of ICU that he finally got to go home for a while before starting rehab. Don't promote the false impression that a moped does not require the same caution as a larger bike. If it can go over 10/15 mph then the same cautions need to be observed. This low speed off almost ended everything and he will be fortunate if he will be able to walk straight. Riding again is not anywhere on the horizon. |
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Post by dollartwentyfive on Feb 26, 2015 20:20:21 GMT -5
well, my post was to imply that if you was out in the middle of nowhere, and faced with this situation, a sealant would work at speeds less than 35 MPH.
it wasn't meant to imply it was a fix, only a patch of sorts.
but, you are correct.
the safest course for any anomaly on 2 wheels is to FIX IT.
it would be all to easy to patch and forget.
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Post by rockynv on Feb 27, 2015 5:40:36 GMT -5
You are supposed to replace valve stems with the tires and technically motorcycle/scooter tires are only good for two years and then their safety becomes questionable so you would really have to be pushing things well beyond reason to need to consider this. Why would you ride out to the middle of nowhere on tires and valve stems past due for replacement. On most scooters the tires are relatively cheap and the valve stems are available locally for just a few dollars even out in most Hick Towns I have been in from Florida to Toronto to Maine.
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Post by jerseyboy on Feb 27, 2015 7:19:31 GMT -5
I soak my stock stems with a rubber conditioner every oil change and they are soft as silk after 3 years.
Yeah,,don't mess around with a stem...keep your new ones conditioned brother...
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Post by oldchopperguy on Feb 28, 2015 0:45:10 GMT -5
Those original Chinese stems are NOT safe... I replaced mine with stainless-steel bolt-down ones from a local Auto-Zone and was very happy with them for years. They were not very expensive, and easy to install.
Quality rubber ones are fine, but I did like the extra safety margin provided by the steel ones.
Please do NOT ride on the old ones. they can come apart without warning. When replacing my own, I was able to simply pull out the brass part, from the crumbling rubber part, with an instant deflation. A true "reality check" for sure!
Ride safe,
Leo in Texas
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Post by earlwb on Mar 2, 2015 14:42:36 GMT -5
The tire sealant will be slung up against the inside of the tire due to centrifugal force. There won't be any seal all up against the tire valve. If the tire valve is bad you have to replace it. Do not ride the scooter until the valves are replaced. You run a huge risk of having a tire go flat instant at high speed. That typically results in a crash and you get huirt and the scooter gets damaged.
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Post by rdhood on Mar 13, 2015 9:50:34 GMT -5
Just a question, and this seems like the right place:
Should I proactively replace my valve stems? I have had the scoot for three months, bought used. It has 450 miles now, and was manufactured in June 2013.
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