BMW K bikes (Bricks)

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1Back to top Go down    Low power on Fri Feb 26, 2016 8:34 pm

diveshadow

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I have just inherited a K1100LT with 30,000 miles on it that has been sitting in a garage for the past seven years. I have installed a new fuel pump along with a new sending uint because the old ones were rusted and gummed up from the old fuel. I had to also to replace the ICU because the original was lost when the battery was removed somewhere along the way of storage for the past seven years.
The bike starts up everytime and as soon as it is warmed up it seems to be running fine. It just seems to have no get up and go to it. While running at 60mph I can increase the throttle and it seems to take about five to ten seconds before the bike starts to pick up more speed. This is my first BMW but it seems to have no power.


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96 K1100LT 0302263
30,000 miles
    

2Back to top Go down    Re: Low power on Fri Feb 26, 2016 8:39 pm

Crazy Frog

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If your bike is a 2 valves per cylinder...
This could be a result of a sticky Mass Air Flow sensor(MAF) or maybe simply a sticky Throttle Position switch(TPS).

First thing to do is to disconnect the TPS.


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1986 k75, 1985 K100rt, 1985 K100rt/EML sidecar.
    

3Back to top Go down    Re: Low power on Fri Feb 26, 2016 8:41 pm

Point-Seven-five

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Three or four tanks of 91 octane with a half bottle of Techron. Get it out and open up the throttle and flush the injectors and fuel pressure regulator.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

4Back to top Go down    Re: Low power on Fri Feb 26, 2016 8:42 pm

RicK G

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Have you checked the air filter box and filter it's a favourite place for mice to make a nest.


__________________________________________________
If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

5Back to top Go down    Re: Low power on Fri Feb 26, 2016 8:55 pm

duck

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Crazy Frog wrote:If your bike is a 2 valves per cylinder...
This could be a result of a sticky Mass Air Flow sensor(MAF) or maybe simply a sticky Throttle Position switch(TPS).

First thing to do is to disconnect the TPS.

If your bike has two valves per cylinder then it is not a K1100.


__________________________________________________
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
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

6Back to top Go down    Re: Low power on Fri Feb 26, 2016 8:57 pm

duck

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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
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

7Back to top Go down    Re: Low power on Sat Feb 27, 2016 10:38 am

Crazy Frog

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duc wrote:If your bike has two valves per cylinder then it is not a K1100.
OOPS, my bad! I didn't pay attention. Embarassed Embarassed


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1986 k75, 1985 K100rt, 1985 K100rt/EML sidecar.
    

8Back to top Go down    low power on Sat Feb 27, 2016 8:44 pm

diveshadow

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I pulled the air filter out and checked the air intake along with the air filter box. All was clean and it is quite a job with all the fairings on this bike. But a least that is one item to check off my list.
I will run it as much as time allows to push a couple of tanks of gas through it. And yes I'm running high octane.


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96 K1100LT 0302263
30,000 miles
    

9Back to top Go down    Re: Low power on Sat Feb 27, 2016 10:46 pm

Holister

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I'd be inclined to do a few checks first before you go running it for any long length of time.
I was going to suggest reading some of the info off the portal page but yours is a 4v 1100 so some of that may not be all that relavant.
Quite often you'll find it's just something simple

  • First check your battery for static charge as well as the charging voltage from the alternator.


  • Check your brakes aren't rubbing.
  • Check your SPs for colour. They'll tell you quite a bit about what's happening fuel wise. Dark and oily or clean and dry (rich/lean). This will tell you if you are getting too much or too little fuel.
  • Try new SPs or test the old ones with a multimeter.
  • What's the tail pipe look like? Soothy or clean?
  • Test the water temp sensor. Is it eathing? Does it return the correct impedance-to-temp reading?
  • If the engine runs smooth and idles, I doubt it will be the injectors but if they're old and haven't been serviced for a while the O-rings may be leeking air into the intake. A new kit will fix that. Crankcase breather could be doing the same.


Sounds like an air/fuel/mixture issue to me.

Good luck


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

10Back to top Go down    Low power on Sun Mar 13, 2016 11:33 pm

diveshadow

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Ok I have ran about three tanks of 93 octane with techron additive, still low power. Its soiunds like the bike is not getting enough fuel. What should my fuel pressure be? I replaced the old fuel pump with an after market fuel pump. When I turn the key on the fuel pump comes on every time, also there is fuel returning to the tank everytime I turn the key on, is this normal? Even if I never start the bike but just turn the key on and off for about five times the fuel pump comes on and fuel is returning to the tank.


__________________________________________________
96 K1100LT 0302263
30,000 miles
    

11Back to top Go down    Re: Low power on Mon Mar 14, 2016 12:41 am

Point-Seven-five

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Are you seeing evidence of a lean fuel mixture? Is the loss of power due to fuel starvation? Does the engine ping at full throttle under load?

My gut feel about your observations is that even if the fuel pressure regulator is working to control pressure in the rail, once the rail is pressurized fuel will be returned to the tank. If you have ever disconnected a fuel line you will know that the fuel system stays pretty well full of fuel and thus won't take much to re-pressurize and then dump fuel back to the tank. Bottom line is that it sounds to me like you are getting fuel to the rail, it just isn't getting to the cylinders.

I don't recall how long you said the bike sat without running. Since it sounds like some fuel is getting to the cylinders I suspect that the injectors may be gummed up beyond what a couple tanks of Techron can remove. There are videos on YouTube that cover ways to check and clean injectors. Some are fairly simple. One place to check is the filter screen at the top of the injector. I haven't done it myself, but I understand they are fairly easy to change, and the filters can be had on eBay for a couple bucks each.

I would go there next or possibly send them out to a shop that specializes in cleaning/rebuilding them.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

12Back to top Go down    Re: Low power on Mon Mar 14, 2016 1:35 am

RicK G

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diveshadow wrote:I have just inherited a K1100LT with 30,000 miles on it that has been sitting in a garage for the past seven years. I have installed a new fuel pump along with a new sending uint because the old ones were rusted and gummed up from the old fuel. I had to also to replace the ICU because the original was lost when the battery was removed somewhere along the way of storage for the past seven years.
The bike starts up everytime and as soon as it is warmed up it seems to be running fine. It just seems to have no get up and go to it. While running at 60mph I can increase the throttle and it seems to take about five to ten seconds before the bike starts to pick up more speed. This is my first BMW but it seems to have no power.
Just rereading the original post. You say a new sending unit? and are you sure you have the correct ECU there are several variants among them even the R1100 ECU will plug into the bike but not sure if it will actually start and the K model units have different units depending on whether you have O2 sensors or a CO2 adjustment. Its the colour of the label that tells you which it is IngeK knows more about that than I do.


__________________________________________________
If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

13Back to top Go down    Re: Low power on Mon Mar 14, 2016 5:47 am

Holister

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"The bike starts up everytime and as soon as it is warmed up it seems to be running fine"

.... I doubt it would be injectors or fuel pressure. If they were blocked or fuel pressure was low, I think it would be hard to start, running very uneven with poor idle.

What sort of throttle response do you get from idle, with no load ie; in neutral

Honestly... check your spark plugs. That will tell you if its running lean or rich. Also, you'll get poor fuel ignition and low power if they don't have a good spark. The SP washer can flatten out and start to leak so you could be losing compression.


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

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