BMW K bikes (Bricks)

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1Back to top Go down   Starting a K100 after long lay off Empty Starting a K100 after long lay off Mon Feb 07, 2022 4:09 am

coopz

coopz
active member
active member
A long time since I posted last, bike has been on work bench for 2 years work has been done on lots of small things now starting on a paint job. So tried starting, new battery new fuel lines and filter  tank had been off for paint strip fresh fuel bike turns over freely no sign of firing, checked fuel line to injectors nothing. I know there is pressure in fuel line when working and there's a sound from fuel pump that something is happening, but I'm wondering how do you prime the system or is there  a way of  dealing with this. The bike has performed well over the years and is in good condition and well looked after. Thanks Coopz


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1985 K100 RS
    

2Back to top Go down   Starting a K100 after long lay off Empty Re: Starting a K100 after long lay off Mon Feb 07, 2022 10:02 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Have you disconnected any of the hose connections in the tank to see if there is a blockage in the filter or one of the lines going to it?

Is there a loose connection in the tank that is letting all the fuel from the pump leak?  This has happened in the past to others.


__________________________________________________
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
    

3Back to top Go down   Starting a K100 after long lay off Empty Re: Starting a K100 after long lay off Mon Feb 07, 2022 12:57 pm

92KK 84WW Olaf

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Life time member
Life time member
Be sure you have either a neutral green light or clutch lever pulled in.


__________________________________________________
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 49,840 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

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
    

4Back to top Go down   Starting a K100 after long lay off Empty starting a K100 after long layoff Mon Feb 07, 2022 9:54 pm

coopz

coopz
active member
active member
Yep have checked all connections fuel lines tec just on the tank internals my K100 is a 1985 with a single bolt down at rear, the downloaded manual I have seems to have a float level indicator in the image mine dos'nt did the later models change just curious thanks


__________________________________________________
1985 K100 RS
    

5Back to top Go down   Starting a K100 after long lay off Empty Re: Starting a K100 after long lay off Mon Feb 07, 2022 11:31 pm

92KK 84WW Olaf

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Life time member
Life time member
The tank internals changed with the change from the bolted down tank. You cannot fit a fuel gauge to early ones. Only the later ones have the float arrangement.

You seem to have the wrong manual.

Any chance the hose connections to the front of the tank are reversed or the hose connections to the fuel pressure regulator are reversed?


__________________________________________________
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 49,840 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

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
    

6Back to top Go down   Starting a K100 after long lay off Empty Starting a K100 after long layoff Mon Feb 07, 2022 11:49 pm

coopz

coopz
active member
active member
Sorry for dragging this out but should you have a full 12 volts at the fuel pump, just put voltmeter on to check and I'm getting around 7 volts when I hit the start button? Battery is fully charged fuel pump clicks when ignition is keyed off, do you think the pump is cactus. no sign of fuel coming out of fuel line to fuel rail.


__________________________________________________
1985 K100 RS
    

7Back to top Go down   Starting a K100 after long lay off Empty Re: Starting a K100 after long lay off Tue Feb 08, 2022 12:17 am

92KK 84WW Olaf

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Life time member
Life time member
Pump could be blocked too, reverse the polarity and try it, running it backwards may free it but to be honest if it sat like that consider the possibility it is cactus. Given their reputation its advisable to have a spare in your shed. Most of the reputation comes from being a pre ethanol bike and also the risks from sitting causing ethanol related damage to the pump damper and mounting. That same pump is in millions of cars around Europe [Fiat Peugeot Lancia VW] and regarded as reliable in the cars so they are very readily available.


__________________________________________________
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 49,840 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

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
    

Arlina

Arlina
Moderator
Moderator


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Starting a K100 after long lay off Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S
    

9Back to top Go down   Starting a K100 after long lay off Empty Starting a K100 after long lay off Fri Feb 11, 2022 8:31 pm

coopz

coopz
active member
active member
Many thanks for replies pump is not pumping at max pressure got it to work by reversing polarity surprise surprise made a hoorible sound so new one ordered  everthing seems to be where it should be so hope the buggar starts when I get the pump. Thanks


__________________________________________________
1985 K100 RS
    

10Back to top Go down   Starting a K100 after long lay off Empty Re: Starting a K100 after long lay off Sat Feb 12, 2022 12:45 pm

yamaguzzi

yamaguzzi
Life time member
Life time member
I started my K100 RS up after a 15 year sleep. Took off the tank and took all the internals out and threw them in the garbage.Cleaned the tank and installed all new in it,put on all new fuel lines ,pressure regulator,cleaned all 4 injectors , made sure all the electrical connections were good and put in a new fully charged battery. Also gave it clean oil and filter.It started like it was running an hour ago ! Ran it on the center stand for 5 minutes then changed the oil and filter. That was around 16,000 miles ago back in Oct of 2017. Took some tweeking at first but was able to travel on it in 2018. I find it easier to just replace everything up front than fooling around with old stuff when bringing a bike back from the dead.


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

11Back to top Go down   Starting a K100 after long lay off Empty Re: Starting a K100 after long lay off Thu Feb 17, 2022 2:06 am

Holister

Holister
Life time member
Life time member
I think you'll find that 7 volts won't be enough to drive the pump at full pressure. Check your fuel injection relay is working ok and that the connector is clean. Good luck.


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1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
 Starting a K100 after long lay off Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

12Back to top Go down   Starting a K100 after long lay off Empty Re: Starting a K100 after long lay off Thu Feb 17, 2022 6:01 am

92KK 84WW Olaf

avatar
Life time member
Life time member
Holister wrote:I think you'll find that 7 volts won't be enough to drive the pump at full pressure. Check your fuel injection relay is working ok and that the connector is clean. Good luck.
On some Ks the horn relay is the same as the fuel pump relay and they can be swapped.


__________________________________________________
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 49,840 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

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
    

13Back to top Go down   Starting a K100 after long lay off Empty Re: Starting a K100 after long lay off Sun Feb 20, 2022 5:05 am

K75cster

K75cster
Life time member
Life time member
If your cylinders are dry sometimes these girls just wont fire, If you shoot a couple of cc's into the spark plug hole she may just accommodate your wishes and start.


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

14Back to top Go down   Starting a K100 after long lay off Empty Re: Starting a K100 after long lay off Sun Feb 20, 2022 10:12 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
https://www.youtube.com/watch?v=DerHlx-bO0s

If you have it, Automatic Transmission Fluid or Marvel Mystery Oil works even better as it has additives that act like penetrating oil and carbon deposit softeners.


__________________________________________________
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
    

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