Kawasaki Concours Forum

The C-14, aka Kawasaki Concours-14, the new one :) => Accessories and modifications - C14/GTR 1400 => Topic started by: VirginiaJim on May 08, 2013, 04:08:13 AM

Title: 90 degree valve stems
Post by: VirginiaJim on May 08, 2013, 04:08:13 AM
I'm thinking of adding a 90 degree valve stem during my next tire change which is going to occur very shortly on the rear wheel.

Murph has two types, a one piece or a two piece.

http://www.murphskits.com/catalog/product_info.php?cPath=130_136&products_id=417 (http://www.murphskits.com/catalog/product_info.php?cPath=130_136&products_id=417)

http://www.murphskits.com/catalog/product_info.php?cPath=130_136&products_id=494 (http://www.murphskits.com/catalog/product_info.php?cPath=130_136&products_id=494)

Any advantage to using either?  The tire is coming off regardless.
Title: Re: 90 degree valve stems
Post by: gPink on May 08, 2013, 04:26:48 AM
I haven't used either but I would think one piece would be better than two piece.
Title: Re: 90 degree valve stems
Post by: VirginiaJim on May 08, 2013, 04:36:40 AM
Less chance of a seal going bad?
Title: Re: 90 degree valve stems
Post by: gPink on May 08, 2013, 04:47:36 AM
It may not be an issue but one less joint to possibly leak.
Title: Re: 90 degree valve stems
Post by: Broz on May 08, 2013, 05:43:39 AM
I went w the 1 piece. Makes airing up so much easier.
Title: Re: 90 degree valve stems
Post by: Sinstr on May 08, 2013, 07:37:53 AM
I have been running th eone piece for the last six months, no problems.
Title: Re: 90 degree valve stems
Post by: CrashGordon on May 08, 2013, 04:18:21 PM
Can't help you on one vs. the other. Went with the one piece at my last tire change and they work great. As was mentioned in an earlier thread, they seem to hold air better than the stock ones did.
Title: Re: 90 degree valve stems
Post by: fmwhit on May 08, 2013, 06:44:15 PM
I have had both and I like the one piece better.  It seems like it is stronger.. Its definitley a great addition to this bike.
Title: Re: 90 degree valve stems
Post by: VirginiaJim on May 09, 2013, 04:26:54 AM
That's what I'll go with then.  Now, I have to remember if I ordered anything from Murph yesterday morning.... ::)
Title: Re: 90 degree valve stems
Post by: C1xRider on May 09, 2013, 11:24:14 PM
I removed my 90 degree valve stem.  I couldn't keep the tire balanced with it on the wheel.  Of course it was only a problem once the speedometer moved into triple digit range, so it might be acceptable to most.  I guess the phrase YMMV is applicable here.   ;)
Title: Re: 90 degree valve stems
Post by: VirginiaJim on May 10, 2013, 04:07:17 AM
This brings up a good point...for the ones that do have the 90 stem, do you have it mounted parallel to the wheel or facing outwards?  I'm thinking parallel at the moment would work best for me.

C1x, did you balance the wheel or did you get balanced via machine?
Title: Re: 90 degree valve stems
Post by: C1xRider on May 10, 2013, 10:13:45 AM
This brings up a good point...for the ones that do have the 90 stem, do you have it mounted parallel to the wheel or facing outwards?  I'm thinking parallel at the moment would work best for me.

C1x, did you balance the wheel or did you get balanced via machine?

I balanced it myself using the gravity method, several times.  I was really surprised how much weight it required the first time after I installed it.  Don't remember exactly, but it was more than I expected.  That was with a PR2 rear.  Never installed one on the front.
Title: Re: 90 degree valve stems
Post by: DGOLD on May 10, 2013, 12:40:16 PM
I love the 90 degree one piece! It faces out and no issues with the balance. Now I don't curse every time I add air.
Title: Re: 90 degree valve stems
Post by: VirginiaJim on May 10, 2013, 12:41:36 PM
Pity, we could use some more cursing.. :censored: :censored: :censored: and  :censored:
Title: Re: 90 degree valve stems
Post by: Conrad on May 10, 2013, 01:07:12 PM
Pity, we could use some more cursing.. :censored: :censored: :censored: and  :censored:

:censored: that :censored:
Title: Re: 90 degree valve stems
Post by: marku8a on May 10, 2013, 02:17:54 PM
I removed my 90 degree valve stem.  I couldn't keep the tire balanced with it on the wheel.  Of course it was only a problem once the speedometer moved into triple digit range, so it might be acceptable to most.  I guess the phrase YMMV is applicable here.   ;)

I have the one piece 90s pointed outboard. I gravity balanced mine and have no problem at XXX mph.

Mark
Title: Re: 90 degree valve stems
Post by: Broz on May 11, 2013, 05:25:12 PM
I removed my 90 degree valve stem.  I couldn't keep the tire balanced with it on the wheel.  Of course it was only a problem once the speedometer moved into triple digit range, so it might be acceptable to most.  I guess the phrase YMMV is applicable here.   ;)

Everyone knows your supposed to have one point to the left and one point to the right and bingo......Balanced.
Title: Re: 90 degree valve stems
Post by: VirginiaJim on May 12, 2013, 07:14:04 AM
I didn't know that...or are you pulling someone's leg?
Title: Re: 90 degree valve stems
Post by: marku8a on May 12, 2013, 10:47:44 AM
Everyone knows your supposed to have one point to the left and one point to the right and bingo......Balanced.

So I guess that explains why mine is balanced. I installed the rear pointing right so it would be on the "up" side while parked on the side stand. I had the dealer install the front while replacing the TPS under warranty. Although I taped a note on the windshield and a note on the wheel itself saying to point right, they installed it pointing left!

VirginiaJim - It shouldn't make any difference having them pointed in the same direction. Having said that, I would be interested to know if someone had a different experience.

Mark
Title: Re: 90 degree valve stems
Post by: Broz on May 12, 2013, 02:16:03 PM
I was joking. But I too had the rear pointing right front left. But flipped the rear to point left to keep it from a hot muffler incase I have to do roadside repair. Haven't ridden bike since  changing it. Waiting for my ECU.  I seriously doubt the few grams  10mm off center will be noticeable.
Title: Re: 90 degree valve stems
Post by: gPink on May 12, 2013, 02:33:49 PM
Oh, it's too late to be joking. Folks have too much invested in stem direction now. I think they need to be turned to the left to offset the weight of the exhaust.
Title: Re: 90 degree valve stems
Post by: VirginiaJim on May 12, 2013, 08:11:15 PM
 :doh: :doh: :doh: :doh:
Title: Re: 90 degree valve stems
Post by: CrashGordon on May 12, 2013, 09:33:41 PM
Both pointed right for easier access when on the sidestand. I never looked at the location of the balance weights, but I did notice a lot of them this time around. Definitely no balance issues, though. I don't run far into triple digit speeds, but I do get there and she's still smooth.
Title: Re: 90 degree valve stems
Post by: Broz on May 13, 2013, 01:24:22 PM
The OEM weights on my rear tire was 2 oz.  when I had cyclegear balance it last time they put 2 oz of stick ons. Which is 8 little chicklet size squares.  Last week when I balanced it it took 6  1/4 oz weights. I split them 3 on each side of the rim.
Title: Re: 90 degree valve stems
Post by: C1xRider on May 14, 2013, 01:59:21 PM
I static balanced mine when I installed it, and the rear took over 4 ounces as I recall.  After the tire was half gone, it developed a up & down vibration, that started around 110mph and got worse as speed increased.  As the tire wore, the starting speed for the vibration became lower and lower.  I knew I'd be replacing the tires before long, so I didn't worry about it, since I don't go that fast very often.   ::)

I don't have any trouble with the stock valve stems, so it wasn't a big deal for to remove it and go back to stock.  I prefer less balancing weight over tire inflation convenience.  Especially since I carry my own air pump.
Title: Re: 90 degree valve stems
Post by: Cold Streak on May 15, 2013, 08:07:32 AM
Quote
Oh, it's too late to be joking. Folks have too much invested in stem direction now. I think they need to be turned to the left to offset the weight of the exhaust.

Agreed.  And the toilet paper must go over the top of the roll, unless you own a cat.   ::)
Title: Re: 90 degree valve stems
Post by: Rhino on May 15, 2013, 09:50:30 AM
Agreed.  And the toilet paper must go over the top of the roll, unless you own a cat.   ::)

Now you've done it, this thread might have to go the arena.
Title: Re: 90 degree valve stems
Post by: stevewfl on May 15, 2013, 12:58:44 PM
I removed my 90 degree valve stem. I couldn't keep the tire balanced with it on the wheel. Of course it was only a problem once the speedometer moved into triple digit range, so it might be acceptable to most.  I guess the phrase YMMV is applicable here.   ;)

I haven't went for this solution since I had a prob on the first bike I tried the 90 degree stems on. 
Title: Re: 90 degree valve stems
Post by: VirginiaJim on May 15, 2013, 01:02:39 PM
What problem was that, Steve?
Title: Re: 90 degree valve stems
Post by: stevewfl on May 15, 2013, 08:29:04 PM
What problem was that, Steve?

Tires wouldn't balance out.  Old stems back on and it was zero issues. 

That wasn't on my C14 though, old Honda bike.  If the bike would've had KiPass, the wheels would've balanced out with the bent stems (and more than likely without weights!)  ;D
Title: Re: 90 degree valve stems
Post by: VirginiaJim on May 16, 2013, 05:53:51 AM
Yep.  Tires would have magically mounted themselves and self balanced with KIPASS.