Just stops running

[Laitch]

Could this heat from melting the fan contribute to this engine just stopping?

Unlikely.

Should I take the tank off and clean the 2 big switch wires?

Is it the wires that are big or is it the switch that is big? What's the function of the switch? I'm only partially awake but that isn't stopping me from asking.

[Jethroww]

Hi, if my memory serves me. They are a round clear plastic wire connection on either side of the large frame tube. I think that is the connection for the main handle bar controls.  Lights/blinkers etc. Thanks

[Laitch]

On a neglected Brick, all electrical connectors should be inspected and cleaned. The most common causes of trouble among these waifs are poor ground connections and clogged fuel systems, including the injectors. After those, orderly testing of wiring from switches and relays can help eliminate suspects. You've had suggestions from Mighty Gryph and frankenduck so if you haven't followed them yet, you might follow through with them.

[frankenduck]

If you can't find the Positaps locally, you can accomplish the same thing with a couple straight pins and some alligator clip test leads. 

Carefully push the pin into the wire you want to test, no need to go all the way through, just far enough to reach the conductor inside.  Clamp the alligator clip test lead to it and connect to your test equipment. 

When you are done pull out the pin.  The hole is very small, but if you are concerned about water getting in, you can seal it with a drop of nail polish or paint.

That's a good idea for a temporary tap.

You could also solder a wire to the pin. Soldering flux would help a lot.

The other option without PosiTaps would be Scotchloks but I hate those because they can cut into the wire that you're tapping into.

[Jethroww]

Hi, Removed the tank today and cleaned with Deoxit all the connectors I could find.  They all looked good. Reassemble with a small bit of dielectric grease on each connector.  Received my posi taps and made the connections as frankenduck suggested.  The green wire from the ignition switch and the green wire from the the tank side of the tank connection. The tank had a solid green and a solid white wire no green/white combination.  When I turn the ignition on to star the bike the led from the igniton is on. The tank led light only comes on when the bike is running.  Hope the solid green was the correct wire. Now will have to take the bike for a good drive and see if it happens again.   Thanks for  all the help.

[frankenduck]

All sounds good. The Grn/Wht wire from the main harness connects to the fuel pump power green wire of the fuel level sender so you did tap into the correct wire.

The fuel pump only gets power when the motor is turning (starting or running) so your LED behavior sounds like everything is working.

Now that you went through all of this trouble your bike will probably not fail again.

[Past-my-Prime]

Now that you went through all of this trouble your bike will probably not fail again.

It's the reverse of the Shrödinger's Cat: It only declares itself dead/alive when you're NOT looking at it.

[Laitch]

It's the reverse of the Shrödinger's Cat . . .:

Sometimes found in scientific reference as Tac Sregnidörhs.

[Jethroww]

Hi bike just stopped running on my way to work 5:30 am.  Both of the LED lights were on when the bike stopped.  The tank led stayed on tor about 2 seconds after it just stopped running.  Could it be the hall sensor again. I replaced it with one Euromotoelectrics.  If memory serves I replaced the hall sensor last year. Going to wait about 30 min and see if it will start back up.
Thanks

[Jethroww]

8Hi again.  Tried starting and no go. Looked around and saw wet pavement under the exhaust.  Pulled fuse 7 and bike started up. Put fuse back in and made it to work. Could I some how disconnect something so I could make my 1 hour drive home tonight? Thanks

[Jethroww]

Also the bike seems to be running hotter.  I put new red Toyota aluminum coolant in when I replaced the melted Bosch fan. If this helps diagnose the problem.

[Laitch]

If you mixed the coolant at a 60:40 or 50:50 coolant:water ratio, there should be no problem with overheating unless the thermostat is defective. Did you ever dismantle and clean the ignition switch as has already been recommended in this thread?

[Jethroww]

hi, yes that is one of the first things I did when it was recommended.  I have never changed the thermostat.  Would you know the size of the o-ring ? I could see if I could get 1 at Carquest or Napa. I do have a replacement thermostat that i purchased from Napa a few weeks ago.
Thanks

[Laitch]

Concentrate on the matter at hand—intermittent stalling and starting failure. Don't go into the weeds. Your engine isn't overheating unless the fan is running and the temperature light is on—given that the light bulb works. Leave the thermostat alone right now.

Have you determined that the fan works?

[Jethroww]

Hi Laitch,  I replaced the fan about 3 weeks ago. The old one stopped working.  Would not  come with the fan button I installed a few years ago. When I got it all apart the fan brushes all melted together.  Put a Spal fan as an replacement.

[Laitch]

Does it work as intended, i.e., when the Brick engine is idling does the fan cycle on then off in 20 minutes or so? Have you checked that out yet?

[Jethroww]

Hi, no I haven't tried that. I have just been drive to work and back. I think I'll turn the fan on for my drive home. If I make it home I will let it idle for 20 min and see if the fan turns on. Thanks

[frankenduck]

If the fuel pump power LED stays lit until after the bike quits then that is good. The fuel pump only gets power when the engine is turning. (starting or running)

Hall Effect Sensor:
http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/hes.diagnose/hes.diagnose.htm

[Jethroww]

Hi. Will take a bottle of water with me on the drive home. If it stalls I wi put some water on the hall sensor cover  and see if she will start back up. Just replaced the ha sensor last year.

[Jethroww]

Hi I did make it home tonight.  About 5 min into ride the bike stopped/started all by itself. All in about less than a second. It would just stop as it did on my way to work this morning.  Left the fan running for the drive home. Turned the fan off when I got home and left the bike running.  About 3 min later the fan came on automatically and then I turned the bike off. So I think the fan is working properly. I didn't take the highway home. So I didn't reach 140 Kilometers per hour speed. If that would cause anything?
Thanks

[Laitch]

So I didn't reach 140 Kilometers per hour speed. If that would cause anything?

That causes the braids of your beard to ripple in the draft.

[frankenduck]

About 5 min into ride the bike stopped/started all by itself. All in about less than a second.

That sounds like a loose/flaky electrical connection SOMEWHERE.

First things I'd check - pull apart -reseat:

Ign control unit (black box up behind the steering head)

Connector for HES (under right side of tank, goes to ICU and has rubber boot around it)

L-Jetronic

Battery ground down near the shift lever

Central grounding point (lots of brown wires under center of tank bolted to the frame

If you have the tank off and want to make sure that your temp warning bulb is good:

[Jethroww]

Hi, cleaned/Deoxit everything under tank including ECU I think it is called. Last Friday morning rode for about 1 hour with no problems.  This morning about 30 min into commute just on the 401 highway bike cut out. This time seemed like it was a fuel problem.  Got on the shoulder and the bike started running again.  Back up to 120  and about 10 min later same thing. Shoulder of highway and bike started back up.  Turned around and on my back home bike started to miss fire then run normal.  Then just miss with any throttle.  Seems to idle but any gas and starts missing.  Like only running on 2 cylinders.  Side of road waiting for CAA.

[Laitch]

It's time to list everything you've done to remedy this so far—what you've disconnected and cleaned, what you've disassembled and cleaned, what you've inspected and kept, what you've tested or inspected then replaced. Doing that in this post will make it easier for readers to assess what might be happening to your Brick without backtracking and missing something or suggesting something that has already been done.

[Jethroww]

Hi. Ok will make s list tonight. Also for got to mentioning last post that both of the 2 led light stayed lit when this was happening this morning.
Thanks