BMW K bikes (Bricks)

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wilbo

wilbo
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My K100 has been superb for 12months apart from a new weird idle issue.  I start the bike from cold, use fast idle and off I go no issues, bike pulls strongly, overtakes well and is returning about 50mpg uk.  once I slow down to a stop though the idle settles down to just over 1k and then slowly drops below like its being starved of fuel but if I twist throttle it picks up fine.  I noticed when it goes like this it also sometimes misses but the weirdest thing is if I kick my side stand out, get off the bike leaving it on it then the  idle increases to normal and it runs without any issues!!

unfortunately I cant ride around at a 75Degree angle so I need to fix it Ha Ha.  Anyone else experienced this?  Give me a starter for ten?  Thanks in advance


__________________________________________________
Current Stable
1983 BMW K100
1996 BMW R100RT
2009 Honda CBF1000
2003 Aprilia RS250
1996 Kawasaki GPZ500s
1955 James Colonel 225cc
    

92KK 84WW Olaf

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Life time member
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Sounds like an in tank problem, pump and/or fuel pickup not correctly located.

I have that issue on an 83 K100RS, previous keeper put in a replacement pump but not correctly so 'runs out of petrol' after using about 13.5 litres. For the moment I just keep it topped up....I also got a K1100LT last October and the PO there has done the same thing!!


__________________________________________________
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 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 39.885miles.

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
    

wilbo

wilbo
Silver member
Silver member
@92KK 84WW Olaf wrote:Sounds like an in tank problem, pump and/or fuel pickup not correctly located.

I have that issue on an 83 K100RS, previous keeper put in a replacement pump but not correctly so 'runs out of petrol' after using about 13.5 litres. For the moment I just keep it topped up....I also got a K1100LT last October and the PO there has done the same thing!!
Thanks for reply, yes I put a new pump in last year and I noticed the screen was not in best condition, new screen on order now from motor works so I will start at tank and work from that as its an awful job getting your hands and small spanners in!


__________________________________________________
Current Stable
1983 BMW K100
1996 BMW R100RT
2009 Honda CBF1000
2003 Aprilia RS250
1996 Kawasaki GPZ500s
1955 James Colonel 225cc
    

mike d

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Life time member
Life time member
'its an awful job getting your hands and small spanners in!'

Try doing it on the faired R11xx bikes! Plastics off, tank off, empty tank, access panel off and still not much access room  Crying or Very sad

Mike

    

92KK 84WW Olaf

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Life time member
Life time member
@mike d wrote:'its an awful job getting your hands and small spanners in!'

Try doing it on the faired R11xx bikes! Plastics off, tank off, empty tank, access panel off and still not much access room  Crying or Very sad

Mike
As the book says, take off the gas cap assembly. If still in difficulty go find a mate that has small hands.


__________________________________________________
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 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 39.885miles.

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
    

wilbo

wilbo
Silver member
Silver member
Sticking fuel injector again! I have never had any luck with K100 injectors! On about 3rd set and always get one or two start hardly spraying.

    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
You need to thoroughly flush the rail.  Possibly(probably) rusted internally.  A good soak for a couple days in vinegar followed by a flush with water and compressed air to blow all the water out.

You might want to think about replacing the inlet filters on the injectors as well.


__________________________________________________
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
    

92KK 84WW Olaf

avatar
Life time member
Life time member
I accidentally put diesel in my K1100 on Christmas Day. I drained off enough to leave about a 10-12% diesel mix. Bike has never been better and the change immediate. 

After doing same to my RS too.

No spannering needed.


__________________________________________________
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 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 39.885miles.

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
    

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