BMW K bikes (Bricks)

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1Back to top Go down    Wont throttle up? on Sun Aug 05, 2018 5:35 pm

Foxxys

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Hi guys, recently posted a thread about bike running but would cut out which turned out to be a breather problem. Has been running sweet since the breather problem was fixed. Went out tonight and broke down, engine stopped and every time I open the throttle it cuts out. Starts and isles but as soon as you go to open up the throttle it hesitates and won't throttle up. Breather is fine and isles fine... I'm gutted after it running so well. Oh and yes I can hear the fuel pump running.

    

2Back to top Go down    Re: Wont throttle up? on Sun Aug 05, 2018 8:44 pm

RicK G

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I would suspect a fuel pump so check the fuel pressure. Remove the fuel filler assembly, 4 screws. Then remove the internal line that goes from pump to filter from the filter. Grasp the line in your hand with your thumb over the end of the line while the line is inside the tank and with the ignition on press the starter button you should be barely able to prevent fuel escaping if the pump is up to scratch. then with the line facing into the tank press the starter and without your thumb on the tube the fuel should come out like a fire hose, but I sure wouldn't recommend using it for a fire hose Very Happy .
If that seems OK put a new filter in and try running it again.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

3Back to top Go down    Re: Wont throttle up? on Mon Aug 06, 2018 6:12 am

Foxxys

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Cheers, now that I think about it I did have the seat up on Saturday night and unplugged the loom that comes from the box with the plunger. Could a dirt connection to this be the culprit. I did notice an alarm going off when I unplugged the cable from the box and the alarm only went off after I turned the ignition on? Anyway 're connected cable to plunger box and seemed fine but can't help thinking this might be the culprit? What is that box under the seat with the plunger?

    

4Back to top Go down    Re: Wont throttle up? on Mon Aug 06, 2018 2:46 pm

Laitch

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@Foxxys wrote:. . . Anyway 're connected cable to plunger box and seemed fine but can't help thinking this might be the culprit? What is that box under the seat with the plunger?
If it looks like the attached photo—with or without the labels—it is part the anti-theft alarm system. If its connectors to the main harness or wires are dirty, corroded, or otherwise compromised, problems can arise.


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1995 K75T 68,000 miles
    

5Back to top Go down    Re: Wont throttle up? on Mon Aug 06, 2018 3:28 pm

Foxxys

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Yea that's the one. I had the cable out of it on Saturday night.

    

6Back to top Go down    Re: Wont throttle up? on Wed Aug 08, 2018 6:36 am

Foxxys

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Does the fuel pump run all the time when the engine is running? Or does it go off and on with the relay according to what the computer says??

    

7Back to top Go down    Re: Wont throttle up? on Wed Aug 08, 2018 6:39 am

Dai

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It runs permanently when the engine is running. The injectors regulate the amount of fuel that the cylinders get.


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'83 K100 upgraded to K100RS spec
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'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
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8Back to top Go down    Re: Wont throttle up? on Sat Aug 18, 2018 7:07 pm

Foxxys

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Finally fixed the problem... faulty spark plugs and a flooded engine... replaced plugs and started up on full throttle with no choke... Perfect now. Tnx to all for help..

    

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