BMW K bikes (Bricks)

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1Back to top Go down   misfire help Empty misfire help Thu Mar 13, 2014 11:58 am

thumperslaw

thumperslaw
Silver member
Silver member
After having this on going battle with my k100lt 1986 i've still got this bloody misfire. 

What i've done so far

Changed fuel pump
fuel filter 
fuel lines (even in the tank)
new full loom
different injectors
fuel rail
f.i brain
ecu
switch gear
plugs
leads
coils
temp sensor
battery
+ & - battery leads
exhaust
brand new inlet rubbers (£££)
air flow 
air box




head has been pulled and checked (fine)

it seems to rev clean when in (N)
but up the road when under load it's "bucking" and mis firing Sad

Help me!


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

2Back to top Go down   misfire help Empty Re: misfire help Thu Mar 13, 2014 12:05 pm

duck

duck
Life time member
Life time member
fuel level sender connector
ignition switch


__________________________________________________
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
    

3Back to top Go down   misfire help Empty Re: misfire help Thu Mar 13, 2014 12:10 pm

thumperslaw

thumperslaw
Silver member
Silver member
I've changed the ignition switch twice.
Changed the fuel sender


It's mis firing on all four pipes


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

4Back to top Go down   misfire help Empty Re: misfire help Thu Mar 13, 2014 12:54 pm

charlie99

charlie99
VIP
VIP
might be time to pull the afm
take the lid off it and check-test the anvil to pin connection of the wiper plate
there are documented fixes for this issue ...


heres what I found
umfortunatly most of my pics have disappeared from servimg

misfire help 2013-016

https://www.k100-forum.com/t1833p550-85-rt-resto-my-attempt-hey-im-not-into-making-a-show-bike#71318


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Omisfire help Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

5Back to top Go down   misfire help Empty Re: misfire help Fri Mar 14, 2014 12:48 am

RicK G

RicK G
admin
admin
Check that the 4 pin connector on the sender is actually connecting properly. The female part of the plug opens up a bit and can cause intermittent connection.
The mistake many people make is to check for continuity of the wires from each side of the plug and not the actual connection of the plug itself.
They only need to open up 0.1mm and you have problems. I ended up replacing mine with a 4 pin spade terminal connector from an auto shop and no more problems.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

6Back to top Go down   misfire help Empty Re: misfire help Fri Mar 14, 2014 5:25 am

charlie99

charlie99
VIP
VIP
good point rick

some folks head directly for the major item  before testing the interconnects ....and proving them reliable  before continuing ....gosh we see this all the time


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Omisfire help Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

7Back to top Go down   misfire help Empty Re: misfire help Sat Mar 15, 2014 5:34 pm

ReneZ

ReneZ
Life time member
Life time member
Making sure all plugs are properly seated might help as well., Often people have issues and then find out the computer plug was not properly seated. This is of course assuming that all connectors are clean ?? :-)


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

Rene


BMW K100 - 1985 (0030029) misfire help Rain
BMW K1200GT - 2003 (ZK01223)
    

8Back to top Go down   misfire help Empty Re: misfire help Sat Mar 15, 2014 6:27 pm

duck

duck
Life time member
Life time member
Make sure your spark plug leads are on securely. They shouldn't wiggle at all.


__________________________________________________
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
    

9Back to top Go down   misfire help Empty Re: misfire help Sat Mar 15, 2014 6:37 pm

ReneZ

ReneZ
Life time member
Life time member
As Duck says, and make sure you have the bobbins on your spark plugs.


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

Rene


BMW K100 - 1985 (0030029) misfire help Rain
BMW K1200GT - 2003 (ZK01223)
    

10Back to top Go down   misfire help Empty Re: misfire help Sat Mar 15, 2014 8:03 pm

japuentes

japuentes
Life time member
Life time member
Hi there, misfiring is usually related to timing, I would check static advance, advance over the rpm range, hall sensors and connectors.
Best regards
JAP


__________________________________________________
misfire help 2854237993 1988 K100RS SE/ABS
    

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