Very frustrating - Honda CRF1000L Africa Twin Forum
 6Likes
Reply
 
Thread Tools
post #1 of 12 (permalink) Old 08-27-2019, 10:23 AM Thread Starter
Member
 
Rubicon Al's Avatar
 
Join Date: Mar 2019
Location: Denver, Dual Sport paradise
Posts: 58
Garage
Very frustrating

So, I went riding Saturday, noticed before I left the rear looked and felt low, about 7 lbs down. Hmm, not good. inspected carefully, nothing,
Aired up, got ready, took an hour, and the tire checked out ok.
High speed run to off road area, down about 4 lbs. Hmm again.
3 hours off road, average speeds around 20 - 30 mph. tire at pressure, no problem.
High speed run home, felt funny halfway, down about 9 lbs. Ok, this is weird.
Aired up, got home, down about 5 lbs. Aired up at home, next morn, pressure ok. Weird again.
At work, (high speed run to work) down again. Now I'm perplexed.
Got home, removed wheel, tire and tube, inspected inside of tire, nothing. Aired up tube, no leaks heard. overinflated tube, put in tub of water, rotating to find leak. NOTHING!!!!
I inspected and tested everything, including valve, nothing.
I spent 45 minutes looking for a slow leak, absolutely nothing. I have had MANY flats in my career in riding, this ain't my first rodeo, and have never encountered this.
This morn the tube was just as full as last night, as though there is no leak.
Is it possible that the valve stem spring is weak, and allowing centrifugal force to depress it and cause this issue?? because I cannot explain this one.
New tube today, but **** if I am not frustrated at what SHOULD be a simple issue.
Just weird.

One cool & froody dude who knows where his towel is!
Rubicon Al is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 08-27-2019, 11:08 AM
Member
 
Chiefkocak's Avatar
 
Join Date: Feb 2018
Location: Lower Slower Delaware
Posts: 55
If you suspect the valve try these, heck try these anyway. Cheap, easy to way to see if your tires are up to pressure. Make sure they are on tight. You get enough to give a friend a set.



Chiefkocak is offline  
post #3 of 12 (permalink) Old 08-27-2019, 01:37 PM
Member
 
Grizzly's Avatar
 
Join Date: Jul 2019
Location: NE Alabama
Posts: 62
Garage
you certainly covered all the possibilities. Looking at your description it does seem that you're only losing pressure when running "high speed". Maybe the force is causing the schrader valve to leak? Maybe replace that inside the stem and see if it helps. Cheap and Easy,. based on your others tests, TBH i dont see it helping....
Maybe a new tube all together?

18 AT AS
Grizzly is offline  
Sponsored Links
Advertisement
 
post #4 of 12 (permalink) Old 08-27-2019, 08:48 PM
Senior Member
 
Cuchulainn's Avatar
 
Join Date: Aug 2017
Location: Denver, CO
Posts: 273
Garage
I would go ahead and replace the core just to rule it out. Whatever the nearest dealership is to you should just give you one if you don't have a spare. I believe wholesale on those is about $8 for 100.

Sent from my SM-G975U1 using Tapatalk
Cuchulainn is offline  
post #5 of 12 (permalink) Old 08-27-2019, 11:35 PM
Senior Member
 
AT-Dragon's Avatar
 
Join Date: Apr 2019
Location: Wyandotte, Michigan
Posts: 490
Garage
Yea Id say bad value stem, replace the core and get some decent caps that seal, not the plastic dust covers...
Cuchulainn and Shadowjack like this.

If necessity is the mother of inventions, then laziness is the baby daddy. A.A.
AT-Dragon is offline  
post #6 of 12 (permalink) Old 08-28-2019, 09:32 AM
Senior Member
 
Join Date: Oct 2016
Location: Pacific North West U.S.A.
Posts: 133
Heck tubes aren't that expensive. Just replace the tube and be done with it.
Robert Detjen and Grizzly like this.
Mudslingr is offline  
post #7 of 12 (permalink) Old 08-28-2019, 11:21 AM
Junior Member
 
Join Date: Jul 2018
Location: Sudan Texas
Posts: 12
Send a message via MSN to Dan P Smith
I've had two friends over the years that had valve stem leaks that only showed at speed. In both cases it was the rubber stem.

2009 Gold Wing LE ABS
2012 Gold Wing ABS
2014 NC 700 XD DCT ABS
2018 Africa Twin AS DCT ABS
Dan P Smith is offline  
post #8 of 12 (permalink) Old 08-28-2019, 08:00 PM
Senior Member
 
Robert Detjen's Avatar
 
Join Date: May 2019
Location: Austin Texas.
Posts: 129
Tires and tubes get hot when you're riding, and hot air expands. So a tiny hole in the tube or stem that may hold air at the cold PSI can leak when it gets hotter and the pressure goes up. You may have a damaged core - but I doubt it's the spring. I'd just replace the tube and be done with it.
Robert Detjen is offline  
post #9 of 12 (permalink) Old 08-29-2019, 08:02 PM
Member
 
dascooter's Avatar
 
Join Date: Jun 2017
Location: Chesterfield, MO
Posts: 68
I love these. But need to split with 4 people since they come in packs of 4 and we need different front and rear pressure. But not really expensive so I'll have 3 spares of each...
dascooter is offline  
post #10 of 12 (permalink) Old 08-29-2019, 10:04 PM
Senior Member
 
Cuchulainn's Avatar
 
Join Date: Aug 2017
Location: Denver, CO
Posts: 273
Garage
Quote:
Originally Posted by Chiefkocak View Post
If you suspect the valve try these, heck try these anyway. Cheap, easy to way to see if your tires are up to pressure. Make sure they are on tight. You get enough to give a friend a set.



https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I have never purchased any of these because I was told many years ago that in the event you break the plastic viewing cap that the tire will loose air rapidly. I am not sure if it is actually true, but if it was is it still the case? Or are there now safeguards in place?

Sent from my SM-G975U1 using Tapatalk
Cuchulainn is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda CRF1000L Africa Twin Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome