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Discussion Starter #1
Had new tires installed (OEM'S) about a week ago. The first time I checked for tire pressure, all the air came out of the valve stem in the rear tire. It is a 90 degree steel stem. I checked to make sure the core was tight and refilled to 41 llbs, and then rechecked and all was fine. I took a ride, but decided afterwards to return to my dealer and have a new core installed. A few days later I re-checked my pressure and the same thing happened. I refilled to 41 llbs, and rechecked the pressure with no problems. Then I took another ride with no problems. Has anything like this happened to any of you? and if so, what was causing the problem? The dealer said that he often has valve cores that sometimes stick and let the air out, but in 40 years of riding this is a first for me. Anyone have any ideas??? Should I try for another valve core??
 

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valve cores do come in different lengths, i'm playing with a vacuum thingy , long storyshort have different length cores in front of me now . the 90 degree may not be compatible with a long core,check the auto shop and see if they have a short core
 

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When you say a 90% steel stem do you mean on of the screw on ones if so they usual come with
warnings not to be used with them in place.
 

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Discussion Starter #4
Problem solved!! When dealer installed two new Bridgestones he balanced tires using Dyna Beads instead of weights. It turns out that as the tires spun, the beads were forced up the valve stem, thereby causing the core to stick whenever I checked the pressure, causing the tire to lose air. The adding of air the forced the beads back into the tire, so that when I checked the pressure just after adding air the valve did not leak. Then after taking a ride the beads are once again forced in to the valve stem starting the whole process over again. The dealer had to dismount the tires and remove all the Dyna Beads, re-balance using weights and re-install tires on bike. All is OK now, but anyone out there with Dyna Beads in their tires should be made aware of this possible problem.
,
 

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Usually the "tried & true" wheel weights seem to be the best way to go............BUT just for the heck of it - I went to the Dynabead webside and saw the specific instructions with pics for the proper way to pour in the beads................. Link: http://www.innovativebalancing.com/serv ... ectInstall
 

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Photo please of 2 valve that cause problem.
 

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I run Dyanbeads on my 400 with no pressure issues so far.
 
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