Check your valve stems! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 18 (permalink) Old 12-06-2007, 09:26 PM Thread Starter
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Check your valve stems!

Hi gang. It's been quite a while since I posted. Too much work and not enough play time, but I do ride nearly every day. Had yesterday off and decided to go for an extended ride with beautiful weather. Checked the bike over and my rear tire was a little low so I pulled out my little compressor to air it up and as I was plugging it onto the valve stem, I noticed the stem was badly cracked around it's base and when I pushed it one way or the other, it leaked badly. Unfortunately, a local KAW shop that installed the new metz 880 a few months ago didn't replace the old stem, and lucky for me, it didn't break off going down the road. Of course, the bike was in my driveway when I noticed this so I couldn't get it to the shop 15 miles away and was stuck replacing the valve stem myself. UGH! Anyway, I got it done and still got to go for my nice evening ride and it is holding air so I feel lucky! Just wanted to alert y'all to something to be aware of!

Hope y'all are doing good!

Fergy
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post #2 of 18 (permalink) Old 12-06-2007, 09:39 PM
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It is usually reccomended to replace your valve stem when you change tires. What I find odd is that yours moved "one way or the other" ..which of course means you have all rubber valve stems.
Next time you get to it replace it with an all metal 90 degree valve. These last longer and have the added benifit of making it easier to check your tire pressure and fill.
Most shops carry the metal "bolt on" stems, but not the 90 degree or 45 degree ones....and I can't find the link I had to where to buy them, so anyone got that info?......... Anyone?.......... Bueller?


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post #3 of 18 (permalink) Old 12-06-2007, 09:41 PM
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Fergy.....Dude....like, welcome back!!!....

It's good to hear from you and learn that you are ok & still regularly blowin' and goin'....

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post #4 of 18 (permalink) Old 12-07-2007, 10:47 AM
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JD had this happen to him on the way back from Kentucky Lake. I was riding behind him and noticed his back tire suddenly squirm, he's on the highway and starts slowing down. I ride up beside him and point to his back tire that was going flat. We pulled over fully expecting to find a nail or something and couldn't find a thing! Ok, so I doubled back to a Walmart, picked up a little compressor and we aired it up again.
We head out again and about time JD got up to speed.. poof.. tire goes flat again! What the heck! so we pull over again, gigure we'll have to male the 368 mile trip home in 2 mile increments when we discovered that the valve stem was leaking.
With the rubber based 90 degree stems they apparently catch some air at highway speeds and this in turn starts wearing on the rubber base. That is why he tire aired up fine, but once we got up to speed it would go flat again.
We pulled into an Advance Auto after a call to Jason to find out what was available. They loaned us a big C-clamp so JD could break the bead and get to the valve stem. Replaced it with a metal based stem and we made it home just fine (Always a little iffy when you break a bead on a tire and you pray that it pops back in ok when yuo pressure it up!)

So.. ESPECIALLY if you have the angled stems, make sure they are the metal base stems

Dianna
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post #5 of 18 (permalink) Old 12-07-2007, 01:41 PM
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Fergy -

Good to hear from you.

Totally agree about the valve stems.

Either, new striaght rubbers ones with every new tire, or, straight steel one for the front and 90 degree steel one for the back. Have the later in my Meanie, very convenient.

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post #6 of 18 (permalink) Old 01-30-2008, 02:21 PM
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Got my 85 valve stems here:

http://tinyurl.com/yvg8yz

Advance has the short straight metal ones a lot cheaper; dunno if they can get the angled ones or not, but if they can, they'd be cheaper there.

hth

Jim

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post #7 of 18 (permalink) Old 01-30-2008, 05:15 PM
 
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I was lucky to get the rubber valve stems i have now. My local Kawasaki Dealer was stumped when i asked for them. They had to sell me a shorter pair from a diffrent modle all togeather.
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post #8 of 18 (permalink) Old 02-13-2008, 03:13 PM
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Quote:
Originally Posted by Dianna View Post
With the rubber based 90 degree stems they apparently catch some air at highway speeds and this in turn starts wearing on the rubber base. That is why the tire aired up fine, but once we got up to speed it would go flat again.

So.. ESPECIALLY if you have the angled stems, make sure they are the metal base stems
This is exactly what I've experienced. Last time I replaced my rear tire, I searched high and low to find a 90 deg. valve stem and bought one from the Honda dealer. Nice metal body but with a rubber gland at the base. Just like Dianna said, the rubber base wore out within 6 months and leaked. Thank goodness for the portable air compressor!

A tip: Install a standard stubby straight valve stem (very reliable) and carry an adapter made out of a 90 deg. air chuck (with clip to hold it on the stem) with a brass schrader valve stem threaded into it. This lets you air up with any gas station air hose which normally wouldn't fit up inside the rim. The brass valve stem is usually sold as an irrigation blow-down adapter or pump bleed adapter and has a 1/4" MPT fitting.

Darrel
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post #9 of 18 (permalink) Old 02-13-2008, 03:19 PM
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Quote:
Originally Posted by J.D. View Post
Got my 85 valve stems here:

http://tinyurl.com/yvg8yz

Advance has the short straight metal ones a lot cheaper; dunno if they can get the angled ones or not, but if they can, they'd be cheaper there.

hth

Jim
I just looked up the 85 deg. stems that JD referenced above and they are nice! I will probably get a pair to install with my next tire change.

Darrel
'03 Vulcan 750 (90k miles)
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-Replaced Stator (9,000 and 16,000 mi.)
-Oil-cooled Stator Mod (photos)
-Replaced and Relocated R/R
-Greased rear splines
-Fused Stator (photos)
-Metzeler ME880 Marathon 170/80-15 (Rear), 110/90-19 (Front)
-TOC MCCTs installed
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post #10 of 18 (permalink) Old 03-27-2010, 03:04 AM
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just ordered the 85 degree valve stems..

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