Author Topic: Advancing timing - do you absolutely need a timing light?  (Read 15050 times)

Offline The Mighty Gryphon

  • ^ Quintessential Motobricker
  • Posts: 4729
Re: Advancing timing - do you absolutely need a timing light?
« Reply #25 on: August 08, 2019, 09:16:29 AM »
I don't know what was posted previously on this question, but when I set the timing I just align the cutout on the sensor plate with the notch in the timing chain cover where it mounts.  I'm pretty certain this is how the factory sets it, and it works well for the 4 bikes I have owned. 

That cutout is where you can see the actual timing marks.  The trouble is, to put a timing light on the marks and actually see them you need to remove the front wheel and the forks.
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue, '89 K100RS Special edition White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS "Moby Brick Too
'89 K100RS SE

Offline volador

  • ^ Proficient Motobricker
  • Posts: 358
  • NEEDS MORE CHROME
Re: Advancing timing - do you absolutely need a timing light?
« Reply #26 on: August 08, 2019, 10:41:28 PM »
"BMW ON" Tech Tips circa Aug 1989

K100 cylinder#1,  K75 cylinder#3
  • NYC
  • 1991 K100RS 1993 K75S ABS
5 BOROUGHS SISYPHEAN SOCIETY "When Life Throws You A Curve... Lean Into It"

Offline almostordinary

  • Motobrick Curious
  • Posts: 49
Re: Advancing timing - do you absolutely need a timing light?
« Reply #27 on: August 11, 2019, 12:39:37 PM »
Back from the dead. Is there a failsafe way to reset timing back to stock?

Mine seems all out of whack and no turning of the sensor is doing anything. Itís the last puzzle to solve before I finally get my bike on the road.
  • Los Angeles
  • 1991 K75s

Offline almostordinary

  • Motobrick Curious
  • Posts: 49
Re: Advancing timing - do you absolutely need a timing light?
« Reply #28 on: August 11, 2019, 01:25:07 PM »
Ok back in the game. Had to set TDC on cylinder 3 for my k75, cylinder 1 for you k100 owners.

http://www.bmw-k100rt-page.eu/manual/Ignition/10_IgnitionSystem.htm

  • Los Angeles
  • 1991 K75s

Offline volador

  • ^ Proficient Motobricker
  • Posts: 358
  • NEEDS MORE CHROME
Re: Advancing timing - do you absolutely need a timing light?
« Reply #29 on: August 11, 2019, 02:07:27 PM »
You need BMW service tool 12 3 650 which is used with a test lead 12 3 651 and install the dial gauge on the appropriate cylinder, and zero it at Top Dead Centre (TDC).

Otherwise your moto will detonate!
  • NYC
  • 1991 K100RS 1993 K75S ABS
5 BOROUGHS SISYPHEAN SOCIETY "When Life Throws You A Curve... Lean Into It"

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