Author Topic: K100 4v '92 long time to ignite & randomly hesitate, stutter, stalls.  (Read 23921 times)

Offline The Mighty Gryphon

  • Administrator
  • ^ Quintessential Motobricker
  • Posts: 6274
That is great news!  So another ignition switch rears to bite an owner.

I have had problems with that switch in two of four bricks I have owned.  It is now one of the first maintenance items when I purchase a new brick.  There is a reason why that switch is #4 on Johnny's list of major whack sources.
http://www.motobrick.com/index.php/topic,11033.0.html
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS16V "Moby Brick Too"

Past:
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline LeMoeur

  • Motobrick Curious
  • Posts: 39
That is great news!  So another ignition switch rears to bite an owner.

I have had problems with that switch in two of four bricks I have owned.  It is now one of the first maintenance items when I purchase a new brick.  There is a reason why that switch is #4 on Johnny's list of major whack sources.
http://www.motobrick.com/index.php/topic,11033.0.html

Oh, wow i get to see this beautiful post only now!
It came to my attention, while doing this search to track down my problem, is that thereís little to no literature about 4v bikes. And if there, itís only found fragmented into posts throughout the internet, in various different sites, like bmwoa, k100forum and of course this one.
So for the little but critical differences that our bike has i thought that would be useful to make a pinned post or maybe anoter ďBert Vogel-styleĒ pdf to gather them all (Ďand in the darkness bind themí).
If anybodyís interested in the project iíll be happy to assemble it in my spare time.. so welcome PMs!
  • GE/SV - Italy
  • K100 RS 1992 16V

Offline Filmcamera

  • ^ Quintessential Motobricker
  • Posts: 1434
I think that is a great idea.  I have a 4V bike as well and seem to find more often than not that what applies to a 2V bike does not apply to mine.


For your reference this is a great site K1100 Owners forum it is aimed at K1100's but they are almost identical in most ways to the 16v K100's, certainly more like them than the 2V bike are.



  • San Jose, Costa Rica
  • 1991 K100RS 16v ABS1, 2018 Triumph Street Triple RS 765
Poserbricker

Offline LeMoeur

  • Motobrick Curious
  • Posts: 39
Guys... after all this time i had to finally go and see the mechanic. Only he could do the TB sync i thought needed to do to make things better for my beloved.
So it was, some syncing, some US cleaning for the TBs and a good regulation of the CO2 pot made my bike run sooo much smoother, or at least it can now keep the idle without stalling.
Although there are still a lot of problems..:
1. Stalling when cold if i do a quick twist of the throttle (on closing)
2. Strange ďpower surgeĒ or ďsobbingĒ whatever itís called from 2k to 4k RPMs only under load (i mean it doesnít happen when in neutral)
3. Terrible mileage.. like.. 7,5km/l or.. 4,7mi/l

Things iíve done.. changing the HT leads to new NGK ones.. while doing that i found the spark plugs to be in bright shape..... [emoji57]



Obviously changing the leads led (pun intended) to nothing.

Now i found this strange plate light behavior:



Any suggestion, Sherlocks?

Thanks as always for your kind collab
  • GE/SV - Italy
  • K100 RS 1992 16V

Offline The Mighty Gryphon

  • Administrator
  • ^ Quintessential Motobricker
  • Posts: 6274
Regarding engine performance: have you checked the engine temperature sensor located behind the radiator?  A bad sensor will lead to a lot of over rich running issues like poor high speed running and poor fuel efficiency.

Flickering light:  I would check/change the bulb and clean the electrical connections behind the taillight assembly.  Engine vibrations are shaking a loose/dirty connection or a damaged filament in the bulb.
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS16V "Moby Brick Too"

Past:
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline LeMoeur

  • Motobrick Curious
  • Posts: 39
Regarding engine performance: have you checked the engine temperature sensor located behind the radiator?  A bad sensor will lead to a lot of over rich running issues like poor high speed running and poor fuel efficiency.

Flickering light:  I would check/change the bulb and clean the electrical connections behind the taillight assembly.  Engine vibrations are shaking a loose/dirty connection or a damaged filament in the bulb.

Iíll be getting new sensors in a week, iíll then proceed to write here if i find any changes.. i see that they are quite cheap and itís not bad to have some cool new gear under a classy old lady!

Regarding the flicker.. itís not the bulb for sure as... it has no bulb, itís led [emoji12] but iíll do the connector check thing, thanks. So.. you think rough running itís higly unrelated to this? Because i found that some of the lights started to act strange, and they appear to be in synch with throttle twisting moves.. moreover i had sporadical ďno pump primingĒ issues, that resolved by themselves [emoji848]
  • GE/SV - Italy
  • K100 RS 1992 16V

Offline BlitzenGruv

  • ^ Proficient Motobricker
  • Posts: 218
  • My first BMW. Been riding old British forever..
change the fuel filter make sure the fuel flow directional arrow is pointed in the correct direction.
It seems to be too simple, but check the fuel line from the filter to see if it has swelled. Only replace this line with fuel line designated for immersion in fuel. DO NOT use the line supplied with replacement filters, it will not survive long immersed in gasoline.
  • Crossville, TN
  • '92 K100rs, 16v, '71 BSA Lightning, '72 Triumph Bonneville, '72 Triumph Trident
You say I'm schizophrenic, but I don't believe we are.

Tags: