Author Topic: Bike Powers down after a long ride?  (Read 141 times)

Offline k projekt

  • Curious
  • Posts: 2
Bike Powers down after a long ride?
« on: August 08, 2019, 06:33:01 AM »
Howdy all!

I've got a 1985 K100RS, my dad has had this bike for many years and it sat in the garage for a few years until i decided to take it to a shop to get it up and running again.

The shop did a great job and got the engine up and running again.

Problem is, after a long ride the bike seems to stop pumping fuel to the rail and will shut off, it feels like its out of gas when it has a full tank.
Once this happens its flashers on and moving to the side of the rode. I'll put my ear up to the engine when i hit the ignition to try and hear the fuel pump kick on and there's nothing, so its a wrecker and another 120$ to get home.

The strange thing is that you only get this problem once you go on a long ride, are we overheating possibly? IDK, any guidance from the community would be helpful, thanks guys!
  • Jacksonville, FL
  • 1985 BMW K100RS

Offline Scott_

  • Forum Moderator
  • ^ Quintessential Motobricker
  • Posts: 1982
Re: Bike Powers down after a long ride?
« Reply #1 on: August 08, 2019, 06:42:37 AM »
As Johnny would say, check the four pin tank connector..... clean and re-seat. This is for starters....
What did the shop do to the bike to get it running..... should be listed on the repair bill.
It's possible it could be the fuel pump, but we aren't there yet in the diagnosis.
  • My Garage
Ride safe.


1997 K1100LT 0302488
1995 K1100LT 0302044
Garmin StreetPilot 2820
Garmin Zumo 550
"One who does not ask questions is ashamed to learn" Danish proverb

Offline johnny

  • TrailBrakingThrottleWhacker
  • ^ Quintessential Motobricker
  • Posts: 6642
  • Whacking...n...Chopping Sliding...n...High Siding
Re: Bike Powers down after a long ride?
« Reply #2 on: August 08, 2019, 07:47:47 AM »
gretings...

poast up some photos of this k projekt... we dont know what you have there... we need to see it... could be the bep3...

j o
  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline Chaos

  • ^ Quintessential Motobricker
  • Posts: 2403
  • Mars needs women!
Re: Bike Powers down after a long ride?
« Reply #3 on: August 08, 2019, 08:21:24 AM »
Sounds like classic Hall Effect Sensor failure.  Especially if it runs again after it cools down. 
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
2012 Ural 2WD sidecar (BMW's bastard step child)

Offline The Mighty Gryphon

  • ^ Quintessential Motobricker
  • Posts: 4536
Re: Bike Powers down after a long ride?
« Reply #4 on: August 08, 2019, 09:01:09 AM »
I'm going with the Hall Effect Sensors too.  Haven't had a bike with that problem around here for a while now.  I figure we're due, and your bike is the one. 

A quick test would be to put the bike up on the center stand, take the sensor cover on the front of the engine off and hit the sensors with a hot air gun while it's idling.  If that stops the engine let it cool, and see if it starts again.
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS "Moby Brick Too

Offline johnny

  • TrailBrakingThrottleWhacker
  • ^ Quintessential Motobricker
  • Posts: 6642
  • Whacking...n...Chopping Sliding...n...High Siding
Re: Bike Powers down after a long ride?
« Reply #5 on: August 08, 2019, 09:22:47 AM »
greetings...

if you are gonna be breaking down on a moto you oughtta getts aaa rv premier...

poast up photos of your moto... did you run the vin to make sure itsa 85... pre 86 are different than 86 and later... depends on build date... not what your title says...

we aints had a whack fore pin around here for a decade or longer... we discussed this in detail on our secret board... the cappuccino craftsmen and dumpsters board...

we are due... its you... you fore pin is whack...

yous is on left side under tank being a 85 and all...

j o
  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline Laitch

  • ^ Quintessential Motobricker
  • Posts: 6711
Re: Bike Powers down after a long ride?
« Reply #6 on: August 08, 2019, 02:34:21 PM »
Sounds like classic Hall Effect Sensor failure.
I'm going with the Hall Effect Sensors too.  . . . A quick test would be to put the bike up on the center stand, take the sensor cover on the front of the engine off and hit the sensors with a hot air gun while it's idling.  If that stops the engine let it cool, and see if it starts again.
He wrote dumpsters board . . .  :welcome

+1 on Hall sensor defect and test.
  • Along the Ridley in Vermont.
  • 1995 K75T 72,000 miles
I wept because I had no radials until I met a man who had no splines.
http://www.motobrick.com/index.php/topic,296.msg53303.html#msg53303

Offline Laitch

  • ^ Quintessential Motobricker
  • Posts: 6711
Re: Bike Powers down after a long ride?
« Reply #7 on: August 08, 2019, 03:05:58 PM »
Hall Effect sensor cover.
  • Along the Ridley in Vermont.
  • 1995 K75T 72,000 miles
I wept because I had no radials until I met a man who had no splines.
http://www.motobrick.com/index.php/topic,296.msg53303.html#msg53303

Offline billday

  • ^ Quintessential Motobricker
  • Posts: 1135
Re: Bike Powers down after a long ride?
« Reply #8 on: August 08, 2019, 06:13:27 PM »
hit the sensors with a hot air gun while it's idling.  If that stops the engine let it cool, and see if it starts again.

Works best if you use your wife's blow dryer.
  • New York State, USA 10977
  • 1985 K100

Offline k projekt

  • Curious
  • Posts: 2
Re: Bike Powers down after a long ride?
« Reply #9 on: August 08, 2019, 10:23:23 PM »
greetings...

if you are gonna be breaking down on a moto you oughtta getts aaa rv premier...

poast up photos of your moto... did you run the vin to make sure itsa 85... pre 86 are different than 86 and later... depends on build date... not what your title says...

we aints had a whack fore pin around here for a decade or longer... we discussed this in detail on our secret board... the cappuccino craftsmen and dumpsters board...

we are due... its you... you fore pin is whack...

yous is on left side under tank being a 85 and all...

j o

I've taken a wire brush to the 4 pin and gave it a good crc bathing, letting it idle and wiggling the connection around proves unfruitful.

The tow truck driver ran the vin, genuine 85. Sad when you know your tow truck driver by name. For the break downs, my dad suggested we rent a trailer from uhaul he can follow me in the car with.

Hall Effect sensor cover.


This is an interesting lead, I'll look into it and keep you guys posted.

Also, new fuel pump/fuel filter came today and was installed, ran around the block just fine.
  • Jacksonville, FL
  • 1985 BMW K100RS

Tags: