BMW K bikes (Bricks)

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jjfishing

jjfishing
active member
active member
I'm replacing the rear rotor and brake pads on my 87 k100rs. I figured I'd change the rear wheel gear oil also. I looked in my manual and it says the rear wheel gear oil is 80 or 90 weight I believe. When I drained the oil it was clearly not gear oil. It was clean, but red like transmission fluid. I've only owned the bike for a few months, so I don't know the history of it. Is there a reason anyone knows of for there to be a different fluid other than traditional gear oil inside? Should I put gear oil in after there's been a different fluid in there? Also, is there a specific type of brake fluid I should use or anything I should be aware of with the rear brakes and rotor, it seems pretty straight forward. Thanks for any info.

    

RicK G

RicK G
admin
admin
Use the recommended gear oil that ATF is not suitable for helical cut gears. As for brake fluid any good brand DOT 4 fluid is suitable.


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

moriarti

moriarti
Life time member
Life time member
Don't trust PO, check gearbox oil as well.


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1984 k100 rs red/black VIN  0004449
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
@moriarti wrote:Don't trust PO, check gearbox oil as well.

It's the reason I change all the fluids and do a complete service when I get a "new" bikes. There are people out there who have no business wrenching on a motorcycle.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

moriarti

moriarti
Life time member
Life time member
@Point-Seven-five wrote:
@moriarti wrote:Don't trust PO, check gearbox oil as well.

It's the reason I change all the fluids and do a complete service when I get a "new" bikes.  There are people out there who have no business wrenching on a motorcycle.
EXACTLY


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1984 k100 rs red/black VIN  0004449
    

Arlina

Arlina
Moderator
Moderator
@Point-Seven-five wrote:
It's the reason I change all the fluids and do a complete service when I get a "new" bikes.  There are people out there who have no business wrenching on a motorcycle.

Got a point there Smile


A year ago had a Yamaha XV535 here, making strange noises.
Owner did a full service himself, been 500km since.
Saw it has enough "oil", altough it didn't look like oil.
Drained it, found coolant.
Enigine non-savable Evil or Very Mad


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Brakes and rear wheel gear oil question  Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S
    

jjfishing

jjfishing
active member
active member
Thanks for all the replies. I'm going to go ahead and change all the fluids.

    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Redline in the US make appropriate gear oil in hypoid GL5. No prizes for guessing what colour it is.


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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-P  - Beemers owned still or sold.

~We all believe what we want to believe in - Rob Dickinson
    

bad boy

bad boy
active member
active member
@Point-Seven-five wrote:It's the reason I change all the fluids and do a complete service when I get a "new" bikes.  There are people out there who have no business wrenching on a motorcycle.
100% agreed


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Cheerz, David

Brakes and rear wheel gear oil question  9438-010

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1997 Peraves Super Ecomobile: a Kevlar reinforced monocoque with outrigger wheels, seating two.
K100 fork, monolever, headlight, indicators, K1100RS gearbox and K1200RS 589 engine, rear wheel
    

yamaguzzi

yamaguzzi
Life time member
Life time member
If it were my bike I'd put in a good 90W gear oil,ride it 20 or so miles and drop it in a clean white container to have a look at it. Then,I would put in fresh 90w gear oil . Oil is cheap gears are not and it's better to be safe than sorry.


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1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

Holister

Holister
Life time member
Life time member
It's probably just Redline Gear oil.... it's red Laughing
I wouldn't worry too much about it. Just replace all your fluids so you have a baseline for all future servicing.
75w90 is recommended in the riders manual
DOT 4 brake fluid.


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1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  Brakes and rear wheel gear oil question  Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

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