Author Topic: 1985 K100 RT That didn't run...does now with issues!  (Read 33917 times)

Offline steven1969

  • Motobrick Curious
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Re: 1985 K100 RT That didn't run...does now!
« Reply #275 on: July 02, 2018, 06:05:26 PM »
What happened to the conclusion on this thread?
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Offline Laitch

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Re: 1985 K100 RT That didn't run...does now!
« Reply #276 on: July 02, 2018, 07:24:24 PM »
What happened to the conclusion on this thread?
It is a continuing thread, steven. Right now, he's trying to solve a headlight switch gear problem. Do you have any help or suggestions to offer?
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 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 Supershooter

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Re: 1985 K100 RT That didn't run...does now!
« Reply #277 on: July 02, 2018, 10:48:01 PM »
Laitch your starting to sound like my wife, if in doubt he's mistaken. :hehehe I was looking at removing the switchgear, wire, and wire connector, from the bike, but it runs through a small hole in the front of the frame. So it looks like the only way it'll come apart is if I cut it an d pull from both ends.

Supershooter
  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

Offline Laitch

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Re: 1985 K100 RT That didn't run...does now!
« Reply #278 on: July 02, 2018, 11:55:46 PM »
So it looks like the only way it'll come apart is . . .
Ask yourself, How was this installed originally—in two pieces, more than two? How did they do that?
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 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 Supershooter

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #279 on: July 03, 2018, 08:50:11 AM »
It looks like it’d fit through the opening if it was the only thing in the hole. Unless I remove everything else it won’t fit. I’m planning to buy a switchgear that’ll need modification to accept and aftermarket cruise so this really shouldn’t be an issue.

Supershooter
  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

Offline Laitch

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #280 on: July 03, 2018, 09:25:01 AM »
It looks like it’d fit through the opening if it was the only thing in the hole.
What else is in the hole—anything of value? Let's have a couple of photos; I haven't been there.
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 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

Online The Mighty Gryphon

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #281 on: July 03, 2018, 10:31:45 AM »
I think you need to remove this piece(#7 side covering).

  • 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 Laitch

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #282 on: July 03, 2018, 10:57:11 AM »
This article might be encouraging.
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 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 Supershooter

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #283 on: July 04, 2018, 12:19:45 PM »
In this case haste made waste. Thanks to All your help, I continued disassembly and removed the evertything intact.

Supershooter
  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

Offline Supershooter

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #284 on: July 15, 2018, 10:08:48 PM »


Switchgear came now I’m working on installation.


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  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

Offline Supershooter

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #285 on: July 22, 2018, 08:17:28 AM »
The headlight works!

I reassembled the bike and took it out on a longer ride after some test riding around my property.

The bike gave me some issues, first it wanted to die riding down the road at highway speed, I fiddled with the electrical connection, fixing this issue, I thought.  When I'd come to stop signs and get stopped and be ready to go again the bike had trouble revving up it acted like it wasn't getting enough fuel and it'd die and restart without me hitting the starter. And then it'd get over its fit and run normally.

I'm not sure what to look at to address this gremlin

Supershooter

  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

Online The Mighty Gryphon

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #286 on: July 22, 2018, 09:47:01 AM »
Have you done anything to increase the reliability of the four pin tank connector?   They get loose and cause problems like you are having.  I would assume you have already been in there, but if you haven't, that is the first place I would look. 

Another source of trouble similar to what you are seeing is the ignition switch.  Do the lights and instruments do strange things when the engine is acting up?  Do you have any problems with the starter turning when you try to start the engine?   A starter that responds intermittently to the start button can be a sign of a dirty ignition switch.
  • 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 Supershooter

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #287 on: July 22, 2018, 05:51:20 PM »
TMG,
I've only cleaned the 4 pin connector under the tank. Is there a maintenance guide/guide to replacement of that?

I did wire in a new ignition key switch last week, maybe one of my solder connections wasn't up to spec. Are there ways to test or clean it?

I do best with pictures or video when it comes to learning how to test and fix.

Thanks for help, Supetshooter

  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

Offline Supershooter

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #288 on: September 09, 2018, 09:40:38 PM »
I disassembled my key switch and the guts looked brand new. I wondering if the folks that sold it and just cleaned it or if it was just that clean after all these years. Unfortunately i didn't fix any thing just checked one more thing off the list. After reassembly I had it other responsibilities that demanded the rest of my day. I plan to check continunuity next, if that doesn't lend any clues I'll be looking for more direction.

Supershooter
  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

Offline Laitch

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Re: 1985 K100 RT That didn't run...does now!
« Reply #289 on: September 09, 2018, 10:21:34 PM »
I removed the starter, cleaned electrical connections that had dry corrosion . . .
Does that mean you cleaned the commutator and checked the length of the brushes?
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 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 Supershooter

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Re: 1985 K100 RT That didn't run...does now!
« Reply #290 on: September 10, 2018, 09:00:31 PM »
Does that mean you cleaned the commutator and checked the length of the brushes?

I only cleaned the external connections.

I'm confused by the question. What's the connection?

My issue seems to be speratic and typically only when going the acclerate after stopping for a stop sign after riding at highway speed. It seems to act like a short, but who knows, I'm not a good mechanic.

Supershooter
  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

Online The Mighty Gryphon

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #291 on: September 10, 2018, 09:37:32 PM »
On an old K bike you need to disassemble the starter(a not difficult job) and check the brush length and clean the crap out of the commutator.

This is important because a number of electrical circuits are grounded through the starter commutator.  If there is a bad ground through the starter you will have all sorts of strange electrical problems.  If you haven't taken the starter apart yet, I strongly advise that you do so before any other troubleshooting. 

Regarding your drivability issues it would be very helpful if you pull the spark plugs and post a clear photo of what the electrodes look like.  That will help identify if your problem is a lean or a rich mixture problem or if the problem is somewhere else like the ignition.

Speaking of fuel mixtures, have you run any Techron through the system recently.  My experience with a couple K bikes that sat in storage is that they need several good doses of Techron to get all the parts in the fuel system working properly.  In my first K100 it took nearly 2,000 miles and at least 6 or 7 tanks with Techron to get it running as smooth and strong as I thought it should.
  • 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 Laitch

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #292 on: September 10, 2018, 10:22:21 PM »
It seems to act like a short, but who knows, I'm not a good mechanic.
Who knows? A legion of owners who have been plagued by this and discussed it with members here. It probably should have been noticed sooner in your case. Anyway, here is robmack's tutorial.
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 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 Supershooter

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #293 on: September 16, 2018, 10:33:28 PM »
Who knows? A legion of owners who have been plagued by this and discussed it with members here. It probably should have been noticed sooner in your case. Anyway, here is robmack's tutorial.

Sometimes I open my mouth when I should just keep quiet.

I do appreciate all the knowledge that's been shared with me thus far and would have already sold this old brick of it hadn't been for finding all you fine folks.

I checked continuity on the key switch wires up to the connector.

I have read the instructions for cleaning the starter and my starter is now sitting on my table ready to be torn down, cleaned and inspected.

My progress was interrupted by my wife and kids wanting to go for an evening ride on the utv and mc, it was time well spent.

Supershooter
  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

Offline Supershooter

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #294 on: September 22, 2018, 09:38:24 PM »
I disassembled the starter, cleaned the carbon off the commuter ring, and reassembled. There was a dark layer of carbon from the brushes and needed Deoxit and a brush to get rid of it.

I reassembled the rest of the bike that had been dismantled to to address the issues I had been having. A short test ride was performed, pervious issues didn't appear during the ride.

I hope I fixed the issues but will need more miles to validate any success, as my issues were serpatic and impossible to replicate on demand.

Hopefully we have an extended Indain summer here in Liberty Township.

Supershooter
  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

Offline jakgieger

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #295 on: September 23, 2018, 12:45:45 AM »
Good luck...it is a nice feeling when things work!
  • Kansas USA
  • 1989 K100rs se
"What we've got here is failure, to communicate.  Some men, you just cain't reach.  So you get what we had here last week.  Which is the way he wants it...Well, he gets it.  I don't like it any more than you men do."

Offline Supershooter

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #296 on: September 24, 2018, 08:47:37 AM »
Another short test ride, 17 miles to the auto parts store for a bottle of Techron, over to the gas station, filled with 91 and rode home. Bike runs good, no speratic issues yet.
Supershoter
  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

Offline Laitch

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #297 on: September 24, 2018, 09:08:53 AM »
This is as dramatic as the final episode of Lost. :giggles The reviews on that were mixed though. Don't be shy; give it some stick and bounce over the potholes to shake out the bugs—within walking distance, of course. Hang in there, Supershooter!
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 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 Supershooter

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Re: 1985 K100 RT That didn't run...does now with issues!
« Reply #298 on: December 27, 2018, 09:35:49 PM »
I took a late afternoon ride earlier this fall before the snow flew. I was able to push the bike a little into a couple of S curves. I was aware of the bikes hesitation the run smooth through the twisties from a prior ride through the same curves a few weeks earlier. So before I left home I adjusted the rear shock to see if it would effect the handling. Unfortunately it didn't change anything and I pushed the bike hard enough to get it to hop through the curves. How do i diagnose what needs attention? It's somewhat unnerving to feel like you might get bucked off, while your leaning into a curve at a brisk rate of speed.

Supershooter
  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

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