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K100-forum.com » Technical, repair and troubleshooting » Engine and transmission » Oil Drip from a rubber boot under the bike

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MikeisonTV

MikeisonTV
Silver member
Silver member
Oil Drip from a rubber boot under the bike E4117010
I’ve got an Oil Drip from a rubber boot under my 91 k100. Anyone know what it’s called and if I need to replace the boot or if it means a seal underneath it is gone too?


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Yep! I'm flipping through the air....that ain't good.
    

Laitch

Laitch
Life time member
Life time member
The boot is torn, its clamp is loose or both.
From the MAX BMW parts fiche:
Oil Drip from a rubber boot under the bike Screen15
Oil Drip from a rubber boot under the bike Screen16


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1995 K75 86,000 miles
Oil Drip from a rubber boot under the bike Usa-lo10
    

MikeisonTV

MikeisonTV
Silver member
Silver member
Awesome. Is there any procedural things I should know or remove and replace if torn kind of thing?


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Yep! I'm flipping through the air....that ain't good.
    

nobbylon

nobbylon
Silver member
Silver member
Motorworks and Motobins both have these boots at £15


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R1100GS Feb 1995
K100RS July 1989
R90s June 1975
R75/6 Feb 1976
F650GD May 2001
    

charlie99

charlie99
VIP
VIP
yeah be careful installing it ...its far too easy to rip the boot again whilst the clutch arm is swinging free and the pressure of the internal spring is pushing the boot outwards , if you have already tightened the boot to the gearbox

sometimes it easier to fit the gland at the clutch arm ….then fit the boot to the gearbox ….after the clutch cable has been fitted and the clutch arm movement is restricted already

hope that helps


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'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

Dai

Dai
Life time member
Life time member
As Charlie says. Access is severely restricted and you need three hands to do the job. If you can find an excuse to pull the swingarm off then that's by far the easiest way to do it. What I do is to attach the boot to the clutch arm and then attach the clutch cable to the arm. This gives you some help when trying to compress the big spring and slide the pivot back in. After that, clamping the boot to the gearbox is (relatively) easy.


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1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

88

88
Life time member
Life time member
Laitch wrote:The boot is torn, its clamp is loose or both.
 A third reason.... The centre seal is just worn out. I replaced the one on my k1 last week for this reason. Which bike have you? It is impossible to do a 16v without removing the exhaust as the expansion box gets in the way of dropping the actuation arm far enough.

When fitting the new boot apply grease, petroleum jelly or silicone spray to the inside edges of the new boot and attach the arm end first, when you push the arm up the big open end usually slides into position without too much hassle.


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Oil Drip from a rubber boot under the bike Ir-log1188....May contain nuts!Oil Drip from a rubber boot under the bike Ir-log11

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

K1100LT 1992 - AKA Big Red
K1100RS - 1995. AKA Rudolf Von Schmurf (in a million bits)
K1/RS - AKA Titan (unique hybrid by Andreas Esterhammer)
    

92KK 84WW Olaf

avatar
Life time member
Life time member
Also, if its a 16v get new exhaust mount rubbers for it. The 16v exhaust can crack and this reduces the risk.

Chances are you will also need some nuts and studs and I never go near an exhaust on an unknown bike without having new washers studs and nuts to hand. The washers should be renewed.


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1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 45,920 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

sidecar paul

sidecar paul
Life time member
Life time member
Sometimes the rubber boot fills with oil over time and when the clutch is operated the oil squirts out. My solo does this and I just loosen the boot, clean out the oil and it's good for another couple of years.

Paul.


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'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
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