BMW K bikes (Bricks)

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1Back to top Go down   simple fix for a complex problem Empty simple fix for a complex problem Wed Jul 04, 2012 9:51 pm

diversity48

diversity48
active member
active member
my k100 was running like crap! come to a stoplight, and it sounded as if it would die out at any second. go to take off and it was running on two cylinders, then, 3, then back to 2 then finally "vroom" and off to the next light. i made the attempt at the most simple fix i could think of: removed the battery cover, tightened down the two poles,maybe getting a 1/8 turn out of each. then removed the "brain box" from beneath the document tray, unplugged it, shot some contact cleaner on all the little pins, and then dabbed each with dialectric grease. put it all back together, and the same thing. the next simplest thing i could think of to do was to charge the battery...left it on a trickle for about 4 hours, til the "green light" came up on the charger. hit the starter button and it fired instantly and settled into normal idle. took it around the block and down the highway...now it runs perfect again! well, as perfect as a 27 year old machine WILL run. moral of the story is to make sure there's a fully charged battery under the seat before starting to rip things apart. does this mean there's a weak charging system, or is it just the "nature of the beast"?Question maybe it has something to do with our 105 degree (F) heat here in sin city??

    

2Back to top Go down   simple fix for a complex problem Empty Re: simple fix for a complex problem Wed Jul 04, 2012 9:58 pm

RicK G

RicK G
admin
admin
Just check the voltage at about 2000rpm it should be 14v +- .2v Then do it again with the headlight turned on. That is if you can turn the light off. With the light on it will probably be .2v lower maybe .3v


__________________________________________________
"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 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

3Back to top Go down   simple fix for a complex problem Empty Re: simple fix for a complex problem Thu Jul 05, 2012 2:47 am

JR_K100RS

JR_K100RS
Life time member
Life time member
G'day diversity48 , sounds similar to a problem I had a while back ( running on two cylinders etc ) ended up being a poor ground connector on one of the coils , give that a geek while you are poking about .

JR

Melbourne Australia


__________________________________________________
Diamond Grey ( 617 ) 1987 K100RS ( European Delivery ) Original owner
    

4Back to top Go down   simple fix for a complex problem Empty Re: simple fix for a complex problem Thu Jul 05, 2012 6:25 am

charlie99

charlie99
VIP
VIP
we have noticed quite a few irregular voltages under running conditions out here in our neck of the woods ..of late ......some were associated with poor connectors at the back of the alternator /regulator ....and worth a pull apart and clean up .....with "deoxit" ....great stuff..

i wouldnt be surprised for you to find ...under load ..(headlights on ).that the battery volts were somewhere under 13 volts ....even at 2500-3000 revs

to me that doesnt seem to sound like a great way to look after a battery ...

good luck ...


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Osimple fix for a complex problem 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   simple fix for a complex problem Empty still doing it Sat Jul 07, 2012 9:01 pm

diversity48

diversity48
active member
active member
been away from the site for a couple of days and just getting back. thanks for the replies! defintely some things to check out monday night. after that last battery charge, i rode it to work and about 1/2 way there (9-10 miles), it started doing the same thing again. i really think it's something electrical but havent had the tank off yet. the battery has plenty of power to spin it over, even with the headlight on...not the most technical measurement of battery power. i usually start it with the light off (it has the switch)... hopefully, i'll have some answers soon, and thanks again for the opinions! i'm thinking it might be heat related...ambient temp here when it started acting up was about 105F. i don't know how that would affect an already warmish motorcycle.

    

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