BMW K bikes (Bricks)

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1Back to top Go down   New here 85 k100 brick Empty New here 85 k100 brick on Thu Mar 26, 2020 12:51 pm

Antbmw

Antbmw
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New here looking for some tips to restore my 85 k100. 27,000 miles but needs a tune

    

2Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Thu Mar 26, 2020 12:55 pm

duck

duck
Life time member
Life time member


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

3Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Thu Mar 26, 2020 12:57 pm

Point-Seven-five

Point-Seven-five
Life time member
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Welcome!  27,000 miles?  Still needs breaking in!  Check all the rubber stuff for cracks and stiffening.  Get a can of Deoxit and go through every switch and electrical connection, especially the grounds.  Change the brake fluid!


__________________________________________________
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
    

4Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Thu Mar 26, 2020 2:15 pm

92KK 84WW Olaf

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Last year I got an 83 one with 29,000 miles. Lots of rubbers replaced, needed full brakes job, services, coolant expansion pipe, tyres, still needs a few things one being that the water pump will give out and eventually the rear main seal too. But a lovely bike to ride too and very happy with it.


__________________________________________________
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 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 36,188  miles
    

5Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Thu Mar 26, 2020 2:26 pm

duck

duck
Life time member
Life time member
I've had plenty of Ks that never had WP or main seal issues.  Yes, then CAN fail and need replacing, but not always.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

6Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Thu Mar 26, 2020 2:35 pm

Dai

Dai
Life time member
Life time member
St Augustine FL... Mmmm... I love that place! Been there three times.

New here 85 k100 brick 177912


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

7Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Tue Mar 31, 2020 4:12 am

Arlina

Arlina
Life time member
Life time member
Welcome Antbmw Smile


__________________________________________________
New here 85 k100 brick Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project
    

8Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Tue Mar 31, 2020 7:09 am

92KK 84WW Olaf

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Life time member
Life time member
@duck wrote:I've had plenty of Ks that never had WP or main seal issues.  Yes, then CAN fail and need replacing, but not always.
I bought a K100RT back in 2013 at 36,000 miles. A year later it needed the WP [original] done and then another year later at 78k miles the rear main seal [also original] and slipped in clutch etc too.. I have no complaint but realise buy an old K you may need to do them. I still have it.


__________________________________________________
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 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 36,188  miles
    

9Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Tue Mar 31, 2020 7:33 am

Antbmw

Antbmw
active member
active member
Duck,
Good morning my main issue is consist running. I feel like the return fuel line is clogged at the tank. I’ll get the engine running which is sometimes hard with out using the starter button to get it warmed up. But once it’s warmed up I can’t just turn the throttle I have to do it really slow to build rpms. Then when I run to long it just seems like all my work goes to a waste. Must be back pressure on the return line. I think I’m going to run a return line straight to the top of the tank temporarily just to see if that’s my problem. After replacing everything in the fuel system I thought I’d be there by now. Any suggestions are always welcome

    

10Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Tue Mar 31, 2020 8:55 am

mike d

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Life time member
Have read through the fault finding guide (it's on the Portal Page).

Have you measured the water temperature sensor when cold. 

Mike

    

11Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Tue Mar 31, 2020 10:17 am

Antbmw

Antbmw
active member
active member
No I haven’t the fan kicks on but it does feel hott

    

12Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Tue Mar 31, 2020 10:35 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
A bad engine temperature sensor will make the fuel injection run rich and can flood the engine.  It's an easy check, but a bitch to replace. 

Return line back pressure can be caused by the check valve at the spigot where the return line enters the tank.  They have been know to stick closed.

Have you replaced the fuel filter.  NAPA 3032 is the one to get.

You may want to run some fuel system cleaner through to clean out any varnish that may have formed in the injectors.  Techron by Chevron is good stuff.  About 6-8 ounces in 5 gallons of fuel is a good mix.  If the bike isn't rideable, I will start it up and run it until the temperature gauge starts to move.  If no gauge, 4-5 minutes is about right.  I'll go out in the garage and do this a couple times a day for a couple weeks.  The idea is to let the cleaner soak for a while and then flush it out while the injectors are being pulsed.  I've only had one bike that didn't respond favorably to this regimen.  In that case it may be necessary to remove the injector to have it cleaned.

Another source of problems is the crankcase breather hose A.K.A. the Z tube.  It's behind the throttle position switch (TPS), and is a very common source of problems when it cracks and allows an air leak in the air box.  It's not expensive and is the first thing I check and replace when I get a new bike.


__________________________________________________
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
    

13Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Tue Mar 31, 2020 10:48 am

mike d

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Life time member
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Hi,

Having written this once it seemed to get lost when I posted it:

The Water temperature sensor has two functions:

1. An input to the EFI (pin 10). If this is faulty, it will send a wrong signal to the EFI, and usually results in rough running. If you measure between Pin 10 and earth on the EFI connector (NOT THE EFI MODLE), then at 20C it should be in the order of 2.5k ohm, and at 80C around 300 ohm. If you get a low resistance when cold it will over fuel, leading to it being difficult to start the bike

2. The other side of it is connected to the temperature switching unit via a connector. 
 
The TSU is located with all the other relays. It controls the fan and the over temperature warning light. The fan is activated first, then at a higher temperature, the light is illuminated. If the bike is running at this stage, then it will still be able to run. If however, the engine is stopped, then with temperature light illuminated, the bike will not be able to be started. It will remain in this state until the engine cools down sufficiently for the temperature light to be switched off.

 
Mike

    

14Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Tue Mar 31, 2020 11:07 am

volador

volador
Life time member
Life time member
Welcome

work around for petrol tank check valve removal by Sidecar Paul

[url=http://www.kforum-tech.com/how-to/Modification for early gas tank.htm]Modification for early gas tank[/url]

if you get a 404

-start here http://www.kforum-tech.com/

-under "How-to from the forum"

-"Modification for early gas tank"


__________________________________________________
1984 K100RS  1991 K100RS  Reap The Wild Wind... Ever Commute Is An Adventure
    

15Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Tue Mar 31, 2020 12:45 pm

Antbmw

Antbmw
active member
active member
Thank you all. Yeah new fuel filter, injectors,z pipe, pressure regulator, and fuel pump. I’ll check into the temp stuff. I completely removed in cleaned the tank but the return fuel line still seemed to have a blockage afterwards

    

16Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Tue Mar 31, 2020 1:05 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
With just 2 gallons of fuel in the tank can you see fuel returning when the engine is running?

There should be a pretty obvious flow in the tank forward of the filler.


__________________________________________________
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
    

17Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Tue Mar 31, 2020 1:11 pm

volador

volador
Life time member
Life time member
fuel pressure regulator my be malfunctioning- stuck closed


__________________________________________________
1984 K100RS  1991 K100RS  Reap The Wild Wind... Ever Commute Is An Adventure
    

18Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Tue Mar 31, 2020 2:02 pm

92KK 84WW Olaf

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Life time member
Life time member
@Antbmw wrote:Thank you all. Yeah new fuel filter, injectors,z pipe, pressure regulator, and fuel pump. I’ll check into the temp stuff. I completely removed in cleaned the tank but the return fuel line still seemed to have a blockage afterwards
You don't mention the vacuum pipes and the vacuum caps. They all need to be good.

As yours is 85 you may have a fuel pressure sensor as ell as a fuel pressure regulator, located beside the fuel pressure regulator.

It doesn't do anything and you don't need it, but it does have a vacuum line that goes around the front of the throttle bodies. Remove the vacuum line and replace it using a vacuum cap same as the others on the throttle body spigot.

At the rear end of the throttle bodies near the Z pipe there is the vacuum line to the fuel pressure regulator....got to make sure that's good and not cracked.


__________________________________________________
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 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 36,188  miles
    

19Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Tue Mar 31, 2020 2:02 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Smooth idle? A basic thing, not related to fuelling obviously, but have you had a squiz at the short, elbow-shaped engine oil breather hose that runs up into the the left rear corner of the airbox? Squeeze it, looks for cracks. A test of this hose is to let the engine idle (trusting that it's smooth initially) then slowly unscrew the engine oil filler cap and watch the idle change. If it changes from smooth to rough the hose is in good nick. If it is cracked and you're slowly turning the throttle and experiencing misfire or stumble, perhaps it's having a hard time simply because this hose is leaking excess air. Worth a quick look.

OEM part number 11 15 1 460 480


__________________________________________________

Sometimes I lie awake at night, and I ask, "What can I do to keep my life from going by so fast?" Then a voice comes to me that says, "Try slowing down at the corners." 

~Charlie Brown

1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '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.

    

20Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Tue Mar 31, 2020 2:38 pm

Antbmw

Antbmw
active member
active member
Z pipe is new. Anyone of you guys live near st. Augustine fl.

    

21Back to top Go down   New here 85 k100 brick Empty 85 on Tue Mar 31, 2020 5:36 pm

daveyson

daveyson
Life time member
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Maybe a blockage in exhaust or air inlet, or both, especially if it hadn't been started in years.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
    

22Back to top Go down   New here 85 k100 brick Empty Re: New here 85 k100 brick on Wed Apr 01, 2020 2:31 am

volador

volador
Life time member
Life time member
@Antbmw wrote:Z pipe is new. Anyone of you guys live near st. Augustine fl.

I'm in Orlando. Just finished 21 day quarantine all clear of the K-19

pm your address I can come over whenever



Last edited by volador on Wed Apr 01, 2020 7:55 am; edited 1 time in total (Reason for editing : spelling error)


__________________________________________________
1984 K100RS  1991 K100RS  Reap The Wild Wind... Ever Commute Is An Adventure
    

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