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1Back to top Go down   Leaky valve stems...front & rear K1100 Empty Leaky valve stems...front & rear K1100 on Tue Sep 08, 2015 10:59 am

DeRodster

DeRodster
Life time member
Life time member
Hi All,
Some advice reqd.
I had new Michelin's fitted last year and shortly after noticed I was losing tyre pressure.
Brought machine back and the valve stems etc were changed.
Shortly after noticed same again and losing a lot of pressure overnight.
Not going back, there so advice needed as to how or what to apply to the stems to stop them leaking.
I have new one's from Motorworks...so hopefully they will be a better job

Thanks in advance
Rod


__________________________________________________
1992 K1100LT 6455194
1943 BSA WM20
1979 Yamaha DT-175
1974 Triumph 3TA / 5TA
1974 Honda 100
1969 Honda 50
    

2Back to top Go down   Leaky valve stems...front & rear K1100 Empty Re: Leaky valve stems...front & rear K1100 on Tue Sep 08, 2015 11:06 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Corrorion round the bead area could be contributing to leakage. After a while, gunk builds up and they often don't take the time to clean it off before fitting new sneakers. BMW's 15mm diametre valve stem is a bit different from most other manufacturers'. Have they replaced them with the correct version? Liberally squirt water round the stems and along the bead and look for air bubbles...


__________________________________________________

“Some people see things that are and ask, ‘Why?’. Some people dream of things that never were and ask, ‘Why not?’. Some people have to go to work...

~George Carlin

1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

    

charlie99

charlie99
VIP
VIP
yes agree twb

the bead area is a good place to start

here's one i'm doing at the moment

after a bit of work with acetone ..( works well ).... still to remove all the crap ...perhaps a bit more buffing to get it all cleaned off ...but you can imagine the before pic

Leaky valve stems...front & rear K1100 20150911

my last front rim used to loose a few pounds week to week and looked very similar after a clean up

Leaky valve stems...front & rear K1100 20150912

the residue is I guess due to the soapy liquid used in gaining a seal during tyre fitment ...

keep at it mate


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OLeaky valve stems...front & rear K1100 Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

4Back to top Go down   Leaky valve stems...front & rear K1100 Empty Re: Leaky valve stems...front & rear K1100 on Tue Sep 08, 2015 10:41 pm

Holister

Holister
Life time member
Life time member
Just to be on the safe side... check you don't have a nail in your tyre.


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  Leaky valve stems...front & rear K1100 Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

Dai

Dai
Life time member
Life time member
I'm with the 'corrosion on the bead' guys. My front rim has to have a new coat of sealant at every tyre change, otherwise it loses approx 6psi a week. Between my tyre fitter and myself we cleaned and polished... and still had to use sealant. He says it's common in cast rims of this age.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

Ringfad

Ringfad
Life time member
Life time member
I agree with the others  - I had this problem a few years ago when I got back into K's and went to my local BMW dealer - they tried to sell me a new rim !!

I found a local tyre specialist who used sealant and problem disappeared - he even did it for free as they are not meant to work on motorcycle tyres :-)


__________________________________________________
Leaky valve stems...front & rear K1100 Ir-log10

   ;BMW; K100RS Style Black 1987 105K Km     ;BMW; K1 Black 1993 51K Km     ;BMW; K1100RS Red 1993 60k miles   ;BMW; K100 16V Black (ex ElectricMonk)  ;BMW;  K1100LT (Swiss) now a RS
    

7Back to top Go down   Leaky valve stems...front & rear K1100 Empty Re: Leaky valve stems...front & rear K1100 on Wed Sep 09, 2015 11:39 am

xpc316e

xpc316e
Gold member
Gold member
The seal of the tyre bead against the rim is the most likely cause, but apparently the wheel itself can become porous with age.


__________________________________________________
VIN 0191428, 1991 K100LT, formerly owned by Lancashire Constabulary. This old warhorse is now 'out to grass' and living in retirement in Suffolk, where it will be showered with appropriate love and care.

VIN 6459609, 1992 K1100LT, another ex-Police machine, even though she now looks like she is a former fire engine.
    

8Back to top Go down   Leaky valve stems...front & rear K1100 Empty Re: Leaky valve stems...front & rear K1100 on Wed Sep 09, 2015 11:56 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
On Airhead Snowflake wheels which were not intended for tubeless tyres, but which we intended to use on them anyway, we'd throughly clean up the detritus that accumulated on the bead area and then clearcoat the entire inner surface of the wheels. I never had leaks and never had a tubeless tyre, without a tube fitted, let go on the non-tubeless approved wheels. Reducing porosity is essential.


__________________________________________________

“Some people see things that are and ask, ‘Why?’. Some people dream of things that never were and ask, ‘Why not?’. Some people have to go to work...

~George Carlin

1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

    

Motorbike Mike

Motorbike Mike
Life time member
Life time member
I had to smile when I started to read this thread.
I Bought a K1100lt earlier this week that had been stood for 17 years!! All's not well as you can imagine and after pumping the tyres up to get the bike into the van,the next day the front was flat again. After several recharges, I decided to investigate with soapy water for curiosities sake. It's leaking like buggery from around the valve stem.
Just as well it's having new tyres!

    

10Back to top Go down   Leaky valve stems...front & rear K1100 Empty Re: Leaky valve stems...front & rear K1100 on Wed Sep 09, 2015 5:39 pm

charlie99

charlie99
VIP
VIP
good find mike


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OLeaky valve stems...front & rear K1100 Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

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