Author Topic: !99n0 K75 RT Electrical gremlin  (Read 1561 times)

Offline alabrew

  • ^ Proficient Motobricker
  • Posts: 153
Re: !99n0 K75 RT Electrical gremlin
« Reply #25 on: July 19, 2019, 06:14:43 PM »
Shot in the dark - could it be the the pump isnt' building enough pressure so it is burning what is in the line but it isn't enough to really run. When it shuts down, there is some pump run-on and now the pressure is there. Could it be the fuel pressure regulator?
  • Alabama
  • 1985 K100, 1991 K100RS
Also:
2005 K1200LT
1979 R65
200,000 miles on BMW motorcycles

Offline daveson

  • ^ SuperNatural Motobricker
  • Posts: 533
Re: !99n0 K75 RT Electrical gremlin
« Reply #26 on: July 19, 2019, 07:27:30 PM »
If the idle speed is low it can effect the lights. If you start it on a cold morning with no choke the idle speed might be that low that a stall results with the lights glowing. The second attempt would be better especially if helped with a twist on the throttle. You might have a semi cruise control type bolt under the twist grip adjusted so that it doesn't fully retract straight away resulting in a higher idle speed on the second attempt. Hopefully that might be the case,  then there is nothing wrong with your bike, apart from the relay,  but I'm guessing it's got high mileage and the bearings have done a lot of work.
  • Victoria, Australia
  • Current;'86 K100RT Past; '97 Yamaha V Star 650 Yamaha V Star

Offline Nick Kennedy

  • Curious
  • Posts: 7
Re: !99n0 K75 RT Electrical gremlin
« Reply #27 on: July 20, 2019, 07:14:13 AM »
Gents
So I bucked up and cleaned my Ign switch last night. Was fairly difficult [ for me anyway ] to reassemble it. But I figured it out and it worked.
Anyway this may have fixed my problem. I hope so. I started it up and it did not shut off for the first time in 3 months.
Thanks to all who have responded, this forum is a great resource!
  • Telluride Colorado
  • K75RT

Offline Laitch

  • Redline 7000
  • Forum Moderator
  • ^ Quintessential Motobricker
  • Posts: 7244
Re: !99n0 K75 RT Electrical gremlin
« Reply #28 on: July 20, 2019, 08:34:21 AM »
So I bucked up and cleaned my Ign switch last night.
:clap:
  • Along the Ridley in Vermont.
  • 1995 K75 72,000 miles
I wept because I had no radials until I met a man who had no splines.
https://tinyurl.com/RillRider

Offline The Mighty Gryphon

  • ^ Quintessential Motobricker
  • Posts: 4742
Re: !99n0 K75 RT Electrical gremlin
« Reply #29 on: July 20, 2019, 09:49:55 AM »
So the saga continues
I start the bike it runs for maybe 30 secs- minute, shuts off with ign oil pressure lights half lit. Turn off key turn on key starts up- runs all day.

Another problem is my starter for some reason has stuck on 3x recently. yesterday I could not find a allen wrench and it turned for over a minute. Starter got warm not hot. Battery is new and strong.


Before I spent any money on a starter relay I would spend an afternoon cleaning the contacts and the connector under the tank for the starter/kill switch on the right handlebar.  Both of the problems you mention could be attributed to or aggravated that switch.
  • 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 The Mighty Gryphon

  • ^ Quintessential Motobricker
  • Posts: 4742
Re: !99n0 K75 RT Electrical gremlin
« Reply #30 on: July 20, 2019, 09:58:52 AM »
Gents
So I bucked up and cleaned my Ign switch last night. Was fairly difficult [ for me anyway ] to reassemble it. But I figured it out and it worked.
Anyway this may have fixed my problem. I hope so. I started it up and it did not shut off for the first time in 3 months.
Thanks to all who have responded, this forum is a great resource!

That switch is a common source for whack on these old girls.  It's good you finally got into it.

I would still take the time to shoot some Deoxit into the Start/Kill switch which may be the source of your starter run-on problem.
  • 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

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