BMW K bikes (Bricks)

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1Back to top Go down   K100 power Empty K100 power Sun Jul 04, 2021 8:44 pm

César Santos

César Santos
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Hi

I bought my K100 some time ago, I had it overhauled, because first I like to have the mechanics ok, then comes the aesthetic.
I have some doubts, even because I don't know anyone with a K100.
Is the bike too short of transmission? I go on 5ªgear at 80km/h and it seems to be running out..., is it normal? The bike doesn't seem to have easy going up above 4/5000rpm, I think it doesn't go up... 120Km/h seems a lot even for this engine, is it really like that or could

The bike have some problem?


Thanks

    

2Back to top Go down   K100 power Empty Re: K100 power Sun Jul 04, 2021 9:38 pm

brickrider2

brickrider2
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Cesar, your motorcycle most certainly has a problem.  The engine in my old K100RS was just waking up at 4.5 k rpm.  Yours should continue building power to redline.  
What have you done to correct this?  What do the spark plugs look like?  Does the engine seem to run smoothly, or does it have significant vibration?  What about the timing?  Is it properly set? Did you measure compression in the cylinders?

If the engine was rebuilt, did it perform as it should immediately after that work? Or, is this problem that suddenly arose only much later?

The only problem I ever had with my K100RS was caused by the plug on the left front underside of the tank - the one that provides electricity to the fuel pump.  It would sometimes make intermittent contact that stopped the fuel pump.  Some replace that troublesome connector entirely.  I solved my problem with some cleaning of the contacts and stretchy silicon tape.   Smile


__________________________________________________
1996 K1100LT
    

3Back to top Go down   K100 power Empty Re: K100 power Mon Jul 05, 2021 4:49 am

César Santos

César Santos
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I don't know the bike's history, I bought it recently, I just have some invoices for previous maintenance.
The only repair I had, apart from a general overhaul, was to put the water/oil pump shaft and seals, it's ok.
The engine seems to work fine to me, it just doesn't go up in rpm and there really are too many vibrations, which I thought were from the structure (it's an LT and has some damaged plastics).
Could the vibration be caused by engine failure?

It looks just right whem ramping up, but the bike doesn't go past 4/5000 rpm.
What can I analyze?
Thanks

    

4Back to top Go down   K100 power Empty Re: K100 power Mon Jul 05, 2021 7:10 am

Laitch

Laitch
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César Santos wrote:What can I analyse?
The list of systems to analyze is a long one. Start with the most simple. Can you describe how completely the moto was disassembled for inspection by the mechanic?

When you twist the throttle grip, you should feel immediate tension as the grip engages the cable. Look at the throttle bodies. 

The throttle cable connected to the throttle grip also connects to a rotating mechanism between two of the throttle bodies. Twist the throttle grip or push the disk with your finger to determine whether some part of the throttle bodies is obstructing the mechanism's rotation, the cable is faulty, or if the mechanism needs lubrication. Sometimes, one of the clamps on the rubber tubes on top of the throttle body next to the throttle cable mechanism will be installed in a way that blocks full rotation of the throttle cable mechanism.

Check those items and tells us what you discover.


__________________________________________________
1995 K75 81,000 miles
K100 power Usa-lo10
    

5Back to top Go down   K100 power Empty Re: K100 power Mon Jul 05, 2021 7:10 pm

César Santos

César Santos
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Hi,

I just checked the entire throttle system, everything seems fine, tension from the very first moment and it goes all the way around, it doesn't seem like that.
But once again I was listening to the engine working and everything seems fine, very right and the rpm goes up well up to 4500/5000, from then on I find it difficult.
I spoke on the phone with the mechanic, he told me about fuel pressure, sometimes a plastic tube gives way... I'll keep testing until I can go there...
Any more suggestions?

Thanks

    

6Back to top Go down   K100 power Empty Re: K100 power Mon Jul 05, 2021 8:53 pm

Point-Seven-five

Point-Seven-five
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Have you checked the ignition timing?  The Hall Effect sensors are mounted on a plate at the front of the engine.  The plate can be rotated so it aligns with an opening in the cover it is mounted in.  If the timing is off, it can be difficult to rev the engine beyond a certain point.

While I've never heard of it, I wonder if the rev limiter is acting up. It does seem odd that the engine won't rev past 4500 rpm which is approximately half of the rev limiter setpoint.


__________________________________________________
Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
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   K100 power Empty Re: K100 power Wed Jul 07, 2021 9:47 am

KapteeniMahtava

KapteeniMahtava
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active member
Hi,
I have same problem with my K1. Lost of power above 5000rpm.
It seem to help if pump the throttle at high rpm. It feels like it is lacking fuel.
I have just done top end over haul with new Rubber hoses and tubes.

    

8Back to top Go down   K100 power Empty Re: K100 power Wed Jul 07, 2021 10:05 am

César Santos

César Santos
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active member
Hi
And managed to solve the problem?

    

9Back to top Go down   K100 power Empty Re: K100 power Wed Jul 07, 2021 10:12 am

KapteeniMahtava

KapteeniMahtava
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No not yet. Just did the first drive after overhaul. Might be fuel or timing issue. Going check these next week..

    

10Back to top Go down   K100 power Empty Re: K100 power Wed Jul 07, 2021 10:40 am

Laitch

Laitch
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I alluded in Reply#4 of this thread to this condition possibly being the cause of dismay. Take a closer look, really close. Laughing


__________________________________________________
1995 K75 81,000 miles
K100 power Usa-lo10
    

11Back to top Go down   K100 power Empty Re: K100 power Wed Jul 07, 2021 11:27 am

KapteeniMahtava

KapteeniMahtava
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Laitch wrote:I alluded in Reply#4 of this thread to this condition possibly being the cause of dismay. Take a closer look, really close. Laughing
This something to look at. Thanks!
When I took the cylinderhead of I had ziptied chain to sprockets, bu have little suspicion that I have stuck chain tensioner.

    

12Back to top Go down   K100 power Empty Re: K100 power Wed Jul 07, 2021 11:51 am

KapteeniMahtava

KapteeniMahtava
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active member
Laitch wrote:I alluded in Reply#4 of this thread to this condition possibly being the cause of dismay. Take a closer look, really close. Laughing
This is it, your were right! It does hit those clams..

    

13Back to top Go down   K100 power Empty Re: K100 power Sun Jul 11, 2021 1:01 pm

César Santos

César Santos
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hi

It's not my problem, I've been checking and everything is ok.

Keep looking..., suggestions???

    

14Back to top Go down   K100 power Empty Re: K100 power Sat Mar 11, 2023 11:55 am

César Santos

César Santos
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Boa tarde


Eu continuo olhando, a moto funciona impecavelmente, mas 3/4000 rpm parece ser o seu limite. Na 5ª marcha vou a 3rpm a 80Km, acima disso treme muito e para chegar a 110/120 parece além do seu limite.
Tenho tentado perceber o que é e qual é o comportamento e as velocidades deste tipo de motos, sei que não são muito rápidas, mas certamente algo não está certo.
Você pode me ajudar com o problema de temporização do motor? como posso verificar?
As velas de ignição e cabos, existe algum teste a ser feito, quando é melhor comprar novos?

Obrigado

    

15Back to top Go down   K100 power Empty Re: K100 power Sat Mar 11, 2023 1:38 pm

duck

duck
Life time member
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I doubt it's a timing issue. The Hall Effect Sensor is secured by two screws and I've never heard of an HES coming loose and altering the timing. When the notch on HES is aligned with the notch on the block where it mounts the timing is correct.

K100 power DSCF6344

 

Another thing: Has it sat unused for a long period of time? Over time old gas in fuel injectors can dry up and turn to varnish which clogs the injectors. This restricts the maximum fuel they can deliver. Whenever I get a K bike I always have the fuel injectors serviced.

More here: http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/fis/fis.htm


__________________________________________________
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
    

16Back to top Go down   K100 power Empty Re: K100 power Sat Mar 11, 2023 10:20 pm

ReneZ

ReneZ
Life time member
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Put your bike in your signature - year/version and VIN if you like so people trying to help know what you’re looking at.

Have a look at the TPS, the little black box at the end of the throttle plate shaft, to see if it restricts or switches to full throttle mode?

Cheers, René


__________________________________________________
Greetings from Florida Australia! Having a 'new' K     Surprised-o: 

Rene


BMW K100 - 1985 (0030029) Scotland K100 power Rain
BMW K1200GT - 2003 (ZK01223) Florida
BMW K1200GT - 2004 (ZK27240) Australia
    

17Back to top Go down   K100 power Empty Re: K100 power Sun Mar 12, 2023 5:39 pm

César Santos

César Santos
active member
active member
My bike is an '86 K100 LT.

Today I made a small trip of 80Kms, what is really noticeable is the vibration as mentioned above.
I'm going to buy new spark plugs, the bike starts very well and works very serenely, I don't think so.
Then I go to the injectors, from the outside they have some corrosion...
Engine timing seems fine to me... photo attached



ThanksK100 power Foto10

    

18Back to top Go down   K100 power Empty Re: K100 power Mon Mar 13, 2023 8:54 am

92KK 84WW Olaf

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You can get a lot of vibration and knocking from injector issues.

If you have done a lot of work check that injector connectors have not been mixed up, the bike will still run but badly. If 1 and 2 got mixed up, or 3 and 4.


__________________________________________________
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 54,800 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.
1983 K100RS 0004449 Odette 55,000 miles. Sprint fairing

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
    

19Back to top Go down   K100 power Empty Re: K100 power Mon Mar 13, 2023 9:21 am

César Santos

César Santos
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Good afternoon,


And how can I understand? just testing?

Thanks

    

20Back to top Go down   K100 power Empty Re: K100 power Mon Mar 13, 2023 9:42 am

Laitch

Laitch
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César Santos wrote:And how can I understand? just testing?
Você sabe usar o Google Tradutor? Você sabia que existe um manual neste site que explica como sua moto funciona, como testar os componentes da motocicleta e o que indicam os resultados do teste? Estou fazendo esta resposta usando o Google Tradutor. Eu espero que você entenda. Laughing

    

21Back to top Go down   K100 power Empty Re: K100 power Mon Mar 13, 2023 10:08 am

César Santos

César Santos
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active member
Good afternoon,

Where can I find this manual? I am not finding...

    

22Back to top Go down   K100 power Empty Re: K100 power Mon Mar 13, 2023 10:21 am

Laitch

Laitch
Life time member
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A link to it is in the Portal. The Portal tab is at the top of this page. The information is in the Tech Page. Its title is Troubleshooting the EFI. Here's the link to the Tech Page in the Portal. Click on I agree. The guide is near the bottom of the Electrical section.

    

23Back to top Go down   K100 power Empty Re: K100 power Thu Mar 16, 2023 8:38 pm

yankeeone

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I had a  problem on my 86 K100, I cleaned the contacts on the rheostat in the airflow meter

    

24Back to top Go down   K100 power Empty Re: K100 power Thu Mar 16, 2023 9:28 pm

92KK 84WW Olaf

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Do we know how much overhaul was done?

Or what components were replaced?

Eg temperature sensor possibly replaced with a 16v one? Or mounted in ptfe tape?

Or fuel tank lines incorrectly connected?

Correct plugs [non resistor type]? Plug bobbins?

Plug leads replaced with 16v leads?


__________________________________________________
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 54,800 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.
1983 K100RS 0004449 Odette 55,000 miles. Sprint fairing

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
    

25Back to top Go down   K100 power Empty Re: K100 power Fri Mar 17, 2023 5:17 am

César Santos

César Santos
active member
active member
Good morning

I don't know the history of the bike, I just know that it was serviced at BMW, as I have the invoices for the service.
I've already bought new spark plugs, this weekend I'll replace them. The cables look like the originals...
How can I tell if the temperature sensor is 16V?
Thank you for your help

    

26Back to top Go down   K100 power Empty Re: K100 power Sun Mar 19, 2023 3:11 pm

César Santos

César Santos
active member
active member
Good,

I've changed spark plugs and everything is the same.
I still think that the has a lot of vibration and little speed, out of curiosity, what are the speeds of these bikes?
Is it normal at 130K/h or does it feel like it's coming to an end?

    

27Back to top Go down   K100 power Empty K100 power Sun Mar 19, 2023 7:14 pm

daveyson

daveyson
Life time member
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Your bike should not vibrate and should do 200km/h, mine does. 

If your bike remains unchanged with cylinder one injector disabled, that's a problem. Same with any of the other cylinders.


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

28Back to top Go down   K100 power Empty Re: K100 power Sun Mar 19, 2023 8:37 pm

92KK 84WW Olaf

avatar
Life time member
Life time member
César Santos wrote:Good morning

I don't know the history of the bike, I just know that it was serviced at BMW, as I have the invoices for the service.
I've already bought new spark plugs, this weekend I'll replace them. The cables look like the originals...
How can I tell if the temperature sensor is 16V?
Thank you for your help

What spark plugs did you buy?


__________________________________________________
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 54,800 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.
1983 K100RS 0004449 Odette 55,000 miles. Sprint fairing

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
    

29Back to top Go down   K100 power Empty K100 power Mon Mar 20, 2023 12:03 am

daveyson

daveyson
Life time member
Life time member
Maybe I should have said, does one of the header pipes seem colder than the others.


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

30Back to top Go down   K100 power Empty Re: K100 power Mon Mar 20, 2023 4:59 am

César Santos

César Santos
active member
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Good morning,

Spark plugs are NGK D7EA.

    

31Back to top Go down   K100 power Empty Re: K100 power Mon Mar 20, 2023 7:31 am

92KK 84WW Olaf

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Life time member
Life time member
César Santos wrote:Good morning,

Spark plugs are NGK D7EA.

They should be good, I have them in my 2v Ks. Are the threaded tops exposed or have they the bobbins on them?


__________________________________________________
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 54,800 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.
1983 K100RS 0004449 Odette 55,000 miles. Sprint fairing

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
    

32Back to top Go down   K100 power Empty Re: K100 power Mon Mar 20, 2023 5:11 pm

César Santos

César Santos
active member
active member
The plugs have the tops with the thread showing or opposite to the old ones. It makes a difference?

The cables are placed with the 4th being the cylinder at the front of the bike and the 1st being the cylinder closest to the center of the bike, is that correct?

    

33Back to top Go down   K100 power Empty Re: K100 power Mon Mar 20, 2023 5:47 pm

duck

duck
Life time member
Life time member
92KK 84WW Olaf wrote:
César Santos wrote:Good morning,

Spark plugs are NGK D7EA.

They should be good, I have them in my 2v Ks. Are the threaded tops exposed or have they the bobbins on them?

a.k.a. terminal nuts

K100 power W4r

I don't know why NGK does not include terminal nuts with the spark plugs. Other brands do.


__________________________________________________
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
    

34Back to top Go down   K100 power Empty Re: K100 power Mon Mar 20, 2023 6:38 pm

92KK 84WW Olaf

avatar
Life time member
Life time member
César Santos wrote:The plugs have the tops with the thread showing or opposite to the old ones. It makes a difference?

The cables are placed with the 4th being the cylinder at the front of the bike and the 1st being the cylinder closest to the center of the bike, is that correct?
No 1 is at the front of the bike, no 4 is at the back.

But for plug leads it is ok, 1 and 4 fire together, 2 and 3 fire together.

The front coil on left as you look at them is for 1 and 4, the rear coil, on right as you look at them is for 2 and 3.

But having the threaded top showing is not good. Problem here and may be your problem too.

You need the terminal nuts, we call them bobbins too. If your old plugs are NGK D7EA you can unscrew them and put them on the new plugs. But if your old ones are Bosch or Beru they are formed and do not unscrew.


__________________________________________________
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 54,800 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.
1983 K100RS 0004449 Odette 55,000 miles. Sprint fairing

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
    

35Back to top Go down   K100 power Empty Re: K100 power Mon Mar 20, 2023 6:44 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
If you need terminal nuts, you can get them at a shop that services small engines for things like pumps and lawn mowers.  They usually have a few old plugs in a bucket that you can take the nuts off of. 

You can also contact your country's NGK distributor and ask the tech support people for a dozen.  They mailed me an envelope with them for no charge.  If enough owners bothered them, NGK might start including them with the plugs.


__________________________________________________
Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
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
    

36Back to top Go down   K100 power Empty Re: K100 power Mon Mar 20, 2023 6:56 pm

César Santos

César Santos
active member
active member
So I have the cables changed, but it is indifferent, but I will change.
The old plugs were Bosch, the tops don't come off, but I'll bring them tomorrow and give feedback.

Thanks again, it's a pleasure to have your help

    

37Back to top Go down   K100 power Empty Re: K100 power Mon Mar 20, 2023 8:23 pm

Laitch

Laitch
Life time member
Life time member
Are the spark plug wires for Cylinder 1 and Cylinder 4 attached to the forward ignition coil and the wires for Cylinder 2 and Cylinder 3 attached to the rearward coil?
K100 power K100_i10

    

38Back to top Go down   K100 power Empty Re: K100 power Mon Mar 20, 2023 8:33 pm

duck

duck
Life time member
Life time member
K100 power C13bAi9


__________________________________________________
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
    

39Back to top Go down   K100 power Empty Re: K100 power Yesterday at 7:15 pm

César Santos

César Santos
active member
active member
Good...


I already put a coil on the spark plugs and managed to get some injectors from a K100 to try, all the same...
It's not all bad, we can exclude these two points.
Is it the MFA? or could it be valves, are these adjusted?

Thanks

    

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