BMW K bikes (Bricks)

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1Back to top Go down   New 87 K100RT owner.   Empty New 87 K100RT owner. Sun Oct 10, 2021 7:56 pm

lomcevok

lomcevok
active member
active member
Have been given an '87 K100RT - parked in dry storage at high altitude for 20+ years.

Was told it was dropped and parked - but found a bunch of "monkeywork" not completed, so have now gotten it running reasonably.  

The bike has the adjustable windshield, but the lowers, radiator surround, intake tubing, side covers are all missing, mirror broken, etc.

But!  It only has 21k miles or so.  Dirty injectors, total mess in the tank (new pump and all plumbing and a serious cleanout), missing tank connectors and burned up fuel level sender.  

Not sure what else I'll find, but I rode it after changing all fluids and lubing the rear drive splines. Did just fine (just big!)

Got some saddlebags recently, not sure what'll be next.  

Bill

    

2Back to top Go down   New 87 K100RT owner.   Empty Re: New 87 K100RT owner. Mon Oct 11, 2021 6:52 am

Arlina

Arlina
Moderator
Moderator
Welcome Bill Smile


__________________________________________________
New 87 K100RT owner.   Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S
    

3Back to top Go down   New 87 K100RT owner.   Empty Re: New 87 K100RT owner. Mon Oct 11, 2021 4:12 pm

bad boy

bad boy
Silver member
Silver member
Bill New 87 K100RT owner.   177912 

and good luck with your K


__________________________________________________
Cheerz, David

New 87 K100RT owner.   9438-010

____________________________________________________________________________
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
    

4Back to top Go down   New 87 K100RT owner.   Empty Re: New 87 K100RT owner. Mon Oct 11, 2021 6:01 pm

Shep

Shep
Platinum member
Platinum member
Welcome to the forum.
Be aware when buying replacement parts that not all of them are identical through the 84 to 87 models.


__________________________________________________
Model        Production Date/Serial Number
K100RS      1984 July/ (F0040448)
K100RS      1986 Dec/ (H0142581)
    

5Back to top Go down   New 87 K100RT owner.   Empty Rode It! (Road it?) Sun Oct 17, 2021 8:32 am

lomcevok

lomcevok
active member
active member
Got my "new to me", "20 year barn find" 87 K100 RT up and going.  Took it to 80mph, smooth as glass, but that was "enough".

Usual troubles - dissolved in-tank pump mount, dead pump, crunchy lines, clogged injectors, removed (failed) tank electrical connector, fried fuel level sender.  (prior owner seemed a bit ham fisted).  Final tweak was removal of the high-altitude jumper bike was brought from Colorado - to the Carolinas... Idle settled right down.  

Couple of questions for the group:

1). Fuel pressure.  Currently have a pressure gauge in the line.  Bike runs as it should despite pressure fluctuating +/- 10% (needle wiggling).  When shut off, it drops rapidly to zero.  Should the pressure drop immediately or remain up for a bit?  How long is "a bit"?  My suspicion is a dodgy FP regulator.  Thoughts?

2). Later model fairing retrofitted?   This bike was owned by the owner of a BMW dealership.  Appears to have electric windscreen from 1990 or later added and rubberized "wings" that mount to the outside edges of the RT fairing.  Is this fairing an add-on or was it offered as option on the 87 K100RT?

3). What next?  Missing a few bits - lowers on fairing, knee pads, etc.  Should I: buy up parts and go back to full RT fairing? Or try to build out "bare bike" (I like the look) but the parts are hard to find.  I could look for an RS fairing, but they seem hard to find also.  I won't cafe it.  Thoughts?

Thanks in advance.  BTW, may be selling this now that it's running well - (I want K75 - smaller/smoother bike).  This one has only about 22k miles on it.

Bill

    

6Back to top Go down   New 87 K100RT owner.   Empty Re: New 87 K100RT owner. Sun Oct 17, 2021 10:57 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Have you cleaned the fuel injectors?  A sticky injector will let fuel leak out of the rail when the engine is shut down, dropping the pressure faster.  On my bikes the pressure can take anywhere from 2-3 seconds to 10 seconds or more to drop to zero.

What is your fuel pressure?  Should be around 35psi.  A little wiggling of the needle at idle wouldn't concern me if the engine was running smoothly, the vacuum connection to the regulator could be causing a little bit of pressure instability.  Check the vacuum on the cylinder #4 throttle body at idle.  I'll bet that the needle on the vacuum gauge is bouncing around like the fuel pressure.

Fairing parts should be pretty easy to find with all the K bikes being hacked up these days.  You should be able to find everything you need on eBay.  If you want to do a RS fairing, I have most of the parts for an 1100 RS fairing like the one in my avatar that I might want to get rid of.  If you want them I could probably bring them down to North Carolina on a visit to my daughter who live outside of Charlotte.


__________________________________________________
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
    

7Back to top Go down   New 87 K100RT owner.   Empty Re: New 87 K100RT owner. Sun Oct 17, 2021 1:10 pm

moriarti

moriarti
Life time member
Life time member
Hi Bill, the 75s are only a handful of Kilos lighter, ride Hight ect are the same,I ride both and dont find much difference with smoothness, You might find it difficult to find another as good as you have,Mabe a good think is in order before you make the decision scratch scratch New 87 K100RT owner.   112350 Why stop at80 mph,or were you still in 3rd gear New 87 K100RT owner.   447221 New 87 K100RT owner.   447221


__________________________________________________
1984 k100 rs red/black VIN  0004449
    

8Back to top Go down   New 87 K100RT owner.   Empty Why only 80 mph? Sun Oct 17, 2021 3:55 pm

lomcevok

lomcevok
active member
active member
@moriarti wrote:... Why stop at80 mph,or were you still in 3rd gear New 87 K100RT owner.   447221 New 87 K100RT owner.   447221

 Moriarity, why not more than 80?  

Well, to be perfectly honest, I chickened out.  No shame in admitting it.

First, the tires are old (my factual reason)

Second, I rode my hip bone across a parking lot many years ago (my emotional reason).  I remember thinking in the 100 ms. after the bars went slack and before impact "this is gonna smart..." and it did.  

[Subsequently, I promised to give up bikes and raised my family... and yet here I am...  Twisted Evil  ]

I intend to sort this scoot out slowly, and enjoy it as a "round towner" before I go racing about, until which, I'll live vicariously in the forums...

Bill

    

9Back to top Go down   New 87 K100RT owner.   Empty Re: New 87 K100RT owner. Sun Oct 17, 2021 4:02 pm

lomcevok

lomcevok
active member
active member
@Point-Seven-five wrote:Have you cleaned the fuel injectors?...

... 2-3 seconds to 10 seconds or more to drop to zero.

...35psi.  ...

Fairing parts ...


Injectors are cleaned and squirting evenly.  

Pressure drops to zero in zero.zero seconds.  New regulator ordered.

I'm above 35 PSI - we'll see what the regulator does.

Re Fairing parts, now that's something to think about... [and I will!].

I have another RS fairing (period correct) and am taking a look at it as well.  

Thanks for the inputs.  Sounds like I'm going to get this whipped.

Bill

    

10Back to top Go down   New 87 K100RT owner.   Empty Re: New 87 K100RT owner. Sun Oct 17, 2021 5:01 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Are all the hose clamps in the fuel tank snug so there are no leaks at the fuel pump or filter?  You would not be the first one to have a leaky hose connection at the filter.


__________________________________________________
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
    

11Back to top Go down   New 87 K100RT owner.   Empty leaks! Sun Oct 17, 2021 5:18 pm

lomcevok

lomcevok
active member
active member
@Point-Seven-five wrote:... leaks at the fuel pump or filter? ... 

Haven't checked that yet.  Good idea!

Bill

    

12Back to top Go down   New 87 K100RT owner.   Empty Re: New 87 K100RT owner. Sun Oct 17, 2021 5:39 pm

moriarti

moriarti
Life time member
Life time member
@lomcevok wrote:
@moriarti wrote:... Why stop at80 mph,or were you still in 3rd gear New 87 K100RT owner.   447221 New 87 K100RT owner.   447221

 Moriarity, why not more than 80?  

Well, to be perfectly honest, I chickened out.  No shame in admitting it.

First, the tires are old (my factual reason)

Second, I rode my hip bone across a parking lot many years ago (my emotional reason).  I remember thinking in the 100 ms. after the bars went slack and before impact "this is gonna smart..." and it did.  

[Subsequently, I promised to give up bikes and raised my family... and yet here I am...    ]

I intend to sort this scoot out slowly, and enjoy it as a "round towner" before I go racing about, until which, I'll live vicariously in the forums...

Bill    BRAVO explanations accepted Very Happy Very Happy


__________________________________________________
1984 k100 rs red/black VIN  0004449
    

13Back to top Go down   New 87 K100RT owner.   Empty K100rt Sun Oct 17, 2021 5:57 pm

daveyson

daveyson
Life time member
Life time member
Another slim possibility. There's a one way valve in the output of the fuel pump to maintain pressure at shutdown. If some gunk gets in fuel might back out the pump at shutdown.

Have you got a photo of the rubber wings?


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

14Back to top Go down   New 87 K100RT owner.   Empty Re: New 87 K100RT owner. Sun Oct 17, 2021 6:33 pm

Shep

Shep
Platinum member
Platinum member
@lomcevok wrote:
@moriarti wrote:... Why stop at80 mph,or were you still in 3rd gear New 87 K100RT owner.   447221 New 87 K100RT owner.   447221

 Moriarity, why not more than 80?  

Well, to be perfectly honest, I chickened out.  No shame in admitting it.

First, the tires are old (my factual reason)

Second, I rode my hip bone across a parking lot many years ago (my emotional reason).  I remember thinking in the 100 ms. after the bars went slack and before impact "this is gonna smart..." and it did.  

[Subsequently, I promised to give up bikes and raised my family... and yet here I am...    ]

I intend to sort this scoot out slowly, and enjoy it as a "round towner" before I go racing about, until which, I'll live vicariously in the forums...

Bill
 Really like your answer. Been there and agree as, "I have also chickened out in the last few years".



Last edited by Shep on Sun Oct 17, 2021 6:35 pm; edited 1 time in total (Reason for editing : Too many "Is".)


__________________________________________________
Model        Production Date/Serial Number
K100RS      1984 July/ (F0040448)
K100RS      1986 Dec/ (H0142581)
    

15Back to top Go down   New 87 K100RT owner.   Empty Photo of "Wingy Thingies" Sun Oct 17, 2021 6:52 pm

lomcevok

lomcevok
active member
active member
@daveyson wrote:... one way valve ...

... photo of the rubber wings?

Yep could be the valve.  More likely, crap went downstream into the reg.  Someone tried to get this running sometime in the last 20 years and smoked a couple of wires to the tank.  Guessing they managed to pump gunk into the rail and nether regions beyond.  Will do the reg and try that.

I have a photo here of the "wings" - haven't seen them elsewhere.  The electric bugscreen is a clue that the original owner, who owned a dealership, may have brought these parts to this bike from a later model.

bill

"Wingy Thingies":

New 87 K100RT owner.   032599e6-ef49-486e-b9d4-978ed0c17035

    

16Back to top Go down   New 87 K100RT owner.   Empty Re: New 87 K100RT owner. Sun Oct 17, 2021 9:51 pm

Woodie

Woodie
Life time member
Life time member
I can't see the photo of the fairing vent wings but I'm pretty sure they are off of a K100LT (1986+).  I have them on my '85 K100RT and I'm sure they were a later add on.New 87 K100RT owner.   K100rt12 Twisted Evil


__________________________________________________
New 87 K100RT owner.   Logo2111
1985 K100RT  52667
1990 K75RT 6018570 (project)

"Keep your stick on the ice.  We're all in this together."  Red Green
    

17Back to top Go down   New 87 K100RT owner.   Empty Trying again on the fairing photo Mon Oct 18, 2021 2:16 pm

lomcevok

lomcevok
active member
active member
Here's another go at the pic.  This time as a .pdf.

http://forum.kforum-tech.com/members-upload/uploads/My_'87_K100.pdf

    

18Back to top Go down   New 87 K100RT owner.   Empty Re: New 87 K100RT owner. Mon Oct 18, 2021 2:18 pm

lomcevok

lomcevok
active member
active member
@Woodie wrote:... pretty sure they are off of a K100LT 

I uploaded a photo here: My_'87_K100.pdf

The black rubber surrounds the mirrors and goes all the way to the end of the fairing.  It has recess in the end, like it continued down the lowers as well.  I've not seen this anywhere else.  Also, the electric windscreen suggests something in the 89-93 range...  Agree, probably a dress-up option on the LT.

Bill

p.s. I like yours and Jims with the white.  Either white, or maybe Baja "yes, I mean really, really, really RED" ... red.

    

19Back to top Go down   New 87 K100RT owner.   Empty K100 rt Mon Oct 18, 2021 7:41 pm

daveyson

daveyson
Life time member
Life time member
Hopefully the previous owner removed the lower panels for easier services and still has them, cause they're half of a special kit, or maybe there's some ID on them somewhere.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

20Back to top Go down   New 87 K100RT owner.   Empty Re: New 87 K100RT owner. Tue Oct 19, 2021 4:42 am

Dai

Dai
Life time member
Life time member
Dunno why, but the aging memory cells say that was a Luftmeister kit. Someone else, somewhere on here posted a similar picture.


__________________________________________________
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
    

21Back to top Go down   New 87 K100RT owner.   Empty Re: New 87 K100RT owner. Tue Oct 19, 2021 10:48 am

lomcevok

lomcevok
active member
active member
@daveyson wrote:Hopefully the previous owner removed the lower panels for easier services and still has them, cause they're half of a special kit, or maybe there's some ID on them somewhere.

Unfortunately, the person who removed them is long gone... No idea where the lowers wound up.  Bummer.

I can't find anything on the Luftmeister "wings" - but it looks very well made, like factory?  The combination with the electric windshield from a 9x K1100 makes for a really nice ride.

Bill

    

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