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1Back to top Go down    Tyre valve on Fri Jan 27, 2017 5:07 pm

smoll1


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Hi all

Does anyone know if rubber tyre valve on my 87 rs is code tr 413. This is 15mm diameter?

I have some tr412 but they are to small. Very Happy Very Happy

I have to replace rear wheel valve as I put some aluminium caps on and commuting through the winter has seized them solid. I think i will stick to plastic valve caps. One lesson learned.

Thanks

Smoll

    

2Back to top Go down    Re: Tyre valve on Sat Jan 28, 2017 3:22 am

Point-Seven-five

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The BMW parts fiche indicates 15mm for 86 and later.


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down    Re: Tyre valve on Sat Jan 28, 2017 6:08 am

92KK 84WW Olaf

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I have stainless steel caps. But they are off every other week for pressure check. I find I notice a pressure drop of even 2 psi in the tyres most especially when cold and typically in winter I would get 4-5c early in the morning and so I usually hit them at the weekendfor a pressure check.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

4Back to top Go down    Re: Tyre valve on Sat Jan 28, 2017 6:11 am

blaKey

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"I think i will stick to plastic valve caps. One lesson learned."

A suggestion if I may...how about a very thin smear of anti seize on the tyre valve? That way you can use (in my opinion) the superior metal valve caps.


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Neil
K100RS 1986 RED!
K100RT 1987 (now nekkid with red bits)

Remember Rule No. 6
    

5Back to top Go down    Re: Tyre valve on Sat Jan 28, 2017 6:19 am

Holister

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Try a tiny smear of any sort of grease (ditto Blakey). That would stop them from seizing. But I agree with Olaf. You probably should be checking your pressures every week or so.

In any case, metal caps are safer. If the Schrader valve fails and your tyre suddenly deflates affraid .... I don't think I would want a plastic cap on there.


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

6Back to top Go down    Re: Tyre valve on Sat Jan 28, 2017 6:52 am

92KK 84WW Olaf

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I did think about the grease too, but then it may end up attracting stuff and it all accumulating inside the cap and getting into the valve. All I do is clean the threads on the outsideof the valve when the cap is off.

The only reason I never put aluminium caps on was these nice coloured anodised ones work well but look good so they get nicked.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

7Back to top Go down    Re: Tyre valve on Sat Jan 28, 2017 7:15 am

BobT

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I have never heard of a Schrader valve failing, the centrifugal force of the wheel makes them seal even tighter.
If you decide to use grease of any sort on them then consider where that grease is going to migrate to when the wheel is spinning at 130 kmh, either down the rubber valve, inside the Schrader or if there is too much, onto the wheel and tyre. You would be amazed how far a small amount of grease can travel. I have seen it 6 foot down the side of an aircraft after the door seals have been greased.
Olaf, you can buy 8 alloy ones for less than a quid [url=http://www.ebay.co.uk/itm/New-8-Pcs-Universal-Aluminium-Tyre-Wheels-Dust-Valve-Caps-For-Car-Bike-Cycle-Van-/311633070515?hash=item488ec749b3:g:hrMAAOSwMNxXXPIU]HERE[/url] so even with them getting nicked they will last a while!

    

8Back to top Go down    Re: Tyre valve on Sat Jan 28, 2017 7:39 am

92KK 84WW Olaf

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BobT you are right on all counts.

We have these little yokes that go round town looking at bikes and see nice fancy valve caps and nick them. When I was a teenager my bedroom was filled with car badges, especially Mercedes Benz, hub caps, fancy bits etc that seemed to fall off every moving vehicle.

Trust me on this one here BobT, they walk big time in cities. So far no one has nicked my stainless ones.....next time I am down your way we can polish them with some T-Cut.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

9Back to top Go down    Re: Tyre valve on Sat Jan 28, 2017 7:46 am

Holister

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@BobT wrote:I have never heard of a Schrader valve failing, the centrifugal force of the wheel makes them seal even tighter.
Schrader valve failure is common enough for you to take precautions considering we are on two wheels. My experience... Noticed my rear tyre was a bit sluggish and when I removed the cap to put some air in the tyre went flat very quickly.... Yes, they fail and that's why I always carry a few spare plus a Schrader valve tool in with my puncture repair kit.. Very Happy. Lucky I had a metal cap which have a rubber seal inside specifically to prevent catastrophic deflation
https://www.google.com.au/search?q=schrader+valve+failure&oq=sc&aqs=chrome.0.69i59j35i39j69i57j0

We're not talking centrifugal force here (although, in theory that's possible too) but just plain failure of the valve mechanism.

As for grease... I believe "thin" and "tiny" smear of grease was mentioned, and in any case common sense should prevail.



Last edited by Holister on Sat Jan 28, 2017 6:03 pm; edited 1 time in total


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

10Back to top Go down    Re: Tyre valve on Sat Jan 28, 2017 7:56 am

92KK 84WW Olaf

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A little thing we always did at a gas station, learnt from an old hand, doesn't work at home with a foot pump, butI always use the compressed air to blow out the valve and threads of any dust before putting the inflator on to the valve.

It is possible when pumping tyres to get contamination on to the valve seal and then you get a slow deflation through the valve and seen it lots of times on the bicycle, probably because its always a hand pump that's used. If you have the removal tool you can take it out to clean it. As in clean the valve.

My caps do have the seal inside. .......


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

11Back to top Go down    Valve on Sat Jan 28, 2017 2:30 pm

smoll1


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Thanks all advice.

I do tend take off regular. They had little oring In the caps. I'm wondering if exhaust could melted it on. The front wheel is fine. I do ride about 200 miles a day round trip.

Thanks again all Very Happy

    

12Back to top Go down    Re: Tyre valve on Sat Jan 28, 2017 2:40 pm

92KK 84WW Olaf

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I don't think exhaust is the problem, but salted roads and a 200 mile daily round trip would not help, 2 weeks of that is 2,000 miles and it would definitely be suffering if its aluminium.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

13Back to top Go down    Valve on Sat Jan 28, 2017 2:45 pm

smoll1


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Yes true tons of salt lately because of the cold. Oh well have get new valve and cut old one off.

    

14Back to top Go down    Re: Tyre valve on Sat Jan 28, 2017 3:47 pm

Avenger GT

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@BobT wrote:I have never heard of a Schrader valve failing, the centrifugal force of the wheel makes them seal even tighter.

You might want to re-think that statement Bob. The valve is on the inside of the rim, so centrifugal force will tend to open it, not seal it tighter.

    

15Back to top Go down    Re: Tyre valve on Sat Jan 28, 2017 4:35 pm

92KK 84WW Olaf

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Smoll

What made me think of the salt was that I went to clean my K today and the salt from a 240 mile run last weekend was showing up everywhere. Every dayriding in it is not good and when you park up after it there is residual heat which salt loves. Same reason after a run on salted roads you wash the bike off with cold not warm water. When I park mine I hose it, hose is beside where I park so its easy and I just wash off all the spray but its still bad.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

16Back to top Go down    Re: Tyre valve on Tue Jan 31, 2017 8:54 pm

Holister

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@smoll1 wrote:Yes true tons of salt lately because of the cold. Oh well have get new valve and cut old one off.
I'm not sure what you mean by "cut the old valve off"?? If you can't remove the cap and want to replace the valve you will need to take it to a m/c tyre shop and get them to fit a new valve stem as it will need to be fitted from the inside. Get a metal stem not rubber, and use stainless steel caps. The short metal valve stems are better because its easier to fit an air hose connector.

You could try some aluminium cleaner. Its acidic and eats the corrosion
In any case, I'm pretty sure that the tyre shop guys would be able to easily remove that cap anyway.


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

17Back to top Go down    Re: Tyre valve on Wed Feb 01, 2017 9:17 am

Dai

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I know where Smoll1 is coming from - I had the same problem but was (eventually) able to solve it with a pair of pliers and some persistance. I'm not doing the same mileage - I only do around fifty miles a day - but I now check both valve caps one a week. Experience and monitoring has taught me that I only need to show the air hose to my tyres once every couple of weeks.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

18Back to top Go down    Valve on Wed Feb 01, 2017 9:25 am

smoll1


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I will try pliers see if can get cap off. Busy week and away weekend hopefully have look beginning of next week. The tyre does need bit air so sooner the better.

Smoll

    

19Back to top Go down    Re: Tyre valve on Wed Feb 01, 2017 9:37 am

Dale S

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I wonder if a little spray of DeOxit on the caps, left to dry for a minuet before screwing back on would provide
any long term corrosion resistance. It would be a lot cleaner than grease.


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1990 BMW K100LT
2003 BMW 540i
1998 Ford f-150
    

20Back to top Go down    Re: Tyre valve on Wed Feb 01, 2017 9:59 am

92KK 84WW Olaf

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Pliers will probably squeeze it, try a little hot water to heat the cap and then it may expand and break the adhesion. Shouldn't affect the seal. Hair dryer might work too.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

21Back to top Go down    Re: Tyre valve on Wed Feb 01, 2017 10:49 am

Point-Seven-five

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Rotate the wheel until the valve is at the top and put a couple drops of penetrating oil on it. Let it sit for a few minutes and tap the top of the cap gently a few times and then try removing it with curved jaw pliers.

As long as you don't plan on reusing the cap don't worry about squeezing too hard. In fact, a bit of distortion of the cap may actually help break the corrosion up and provide some clearance for the penetrating oil to flow into. Just don't go crazy and do the gorilla thing with the pliers.

It may also help to gently grasp the valve just below the cap with a second pliers to prevent the valve from rotating in the wheel. Wrap a bit of rag around the valve to protect it from the jaws of the pliers.

Another option would be to wrap a couple layers of aluminium foil around the valve leaving the cap exposed. Then expose the cap to two or three seconds of the flame from a torch to expand the cap.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

22Back to top Go down    Valve on Wed Feb 01, 2017 5:16 pm

smoll1


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Yes I will heat and try penetrating oil. Fingers crossed get it off. I will let u all know what works best.

    

23Back to top Go down    Valve on Tue Feb 07, 2017 4:50 pm

smoll1


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Well tried oil and heat but no success. Changed valve in end. Lucky I did as found nail in tyre. Wasn't too much tread left luckily. So new tyre on now as well. Oh well never mind. Thanks for all the advice. Very Happy

Smoll

    

24Back to top Go down    Re: Tyre valve on Tue Feb 07, 2017 5:11 pm

92KK 84WW Olaf

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Speaking of nails, lastSeptember I had a nail in a tyre and decided to go to a bike shop to get it done with the mushroomas I only had the standard repair kit for emergencies. When the job was done the guy in the bike shop asked me if I wanted the nails. Yep, plural. Then I fitted new tyres end of October. Today pulling off the rear end for main seal more nails embedded in the tyre which admittedly now has over 4,000 miles on it. Took very close inspection and now I am close to advising taking the tyres off and checking them once or twice in their lifetime and before a long trip away from home, the nail heads come off and all that's left is the nail stem which the tyre almost closes over.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

25Back to top Go down    Re: Tyre valve on Tue Feb 07, 2017 9:39 pm

wilcom

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@smoll1 wrote:Well tried oil and heat but no success. Changed valve in end. Lucky I did as found nail in tyre. Wasn't too much tread left luckily. So new tyre on now as well. Oh well never mind. Thanks for all the advice. Very Happy

Smoll

Good idea............I think you nailed it!


__________________________________________________
Joe Wilkerson
Telephone man with a splash of Data
Menifee, CA
1989 K100RS SE


past
1979 BMW R65
1980 BMW R65
1982 BMW R80RT (Gas hog)
1974 BMW R90/6
1972 BMW R75
1964 BMW R50 Earles forks( as reliable as a hammer)
2009 Buel XB12R (the FI sucked)
1999 Buell (Yeah! a carburetor)
2005 Suzuki Bandit 1200
1991 Kaw ZX-11 OMG
1966 Norton 750 (had to have a chase car for anything over 5 miles)
1961 Norton 650' (see above)
1964 Honda 305 Superhawk
and a dozen or so I have forgotten about..........
    

26Back to top Go down    Re: Tyre valve on Wed Feb 08, 2017 3:00 am

Holister

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@92KK 84WW Olaf wrote:Speaking of nails,.....

.... the nail heads come off and all that's left is the nail stem which the tyre almost closes over.
I had one like that Olaf a couple of years ago. I think the nail had been there since just after I fitted the tyre but I didn't find it till the tyre started going down at an increasing rate and I inspected more closely. It was hard to find. Repaired it with a rope plug and it lasted for the remaining 10 or 12k.


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

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