Author Topic: 1985 K100 RT That didn't run...does now with issues!  (Read 23378 times)

Offline Supershooter

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1985 K100 RT That didn't run...does now with issues!
« on: December 13, 2016, 08:34:33 PM »
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Here starts, the project.
The bike was purchased from a couple who inherited it from a brother who passed too soon. The bike sat for an unknown amount of time and the previous owner started the process to get it running but figured out it was going to be more than he wanted to tackle.


-Purchased mid November
- online research and YouTube video learning
-Cyber Monday ordered a set of filters and oil from Beemer bone yard
-Dec 11 evaluated tank, some debris but other wise in good shape
-Dec 13 checked air filter loos new, spark plugs wet


Until next time...


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

Offline The Mighty Gryphon

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #1 on: December 13, 2016, 10:51:01 PM »
Are the plugs wet from an attempt to start it?  The air filter looks new? 

If you have been cranking for any length of time I hope you treat the battery to some charging when you're done.

Otherwise, it looks like you are doing nicely.  Keep us posted and don't hesitate to ask questions.  It's looking a bit slow around here lately and the brain trust needs some stimulation.

P.S. are you going to do something about that yellow spark plug cover plate?
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '92K100RS White, '94 K75S Dakar Yellow
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'94 K75S "Cheetos"
'91 K100RS "Moby Brick Too

Offline Scud

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #2 on: December 13, 2016, 11:12:28 PM »
How many miles on the bike? 


Have you checked the date code on the tires? That could give you a clue about how long it's been sitting - and how soon you should buy new tires.


Did you get the luggage and other body panels with the bike?


The bike can be improved quickly with some black spray paint on that plug cover. That's one of those things that probably "seemed like a good idea at the time..."


PS - I enjoyed your other brief thread about the gas tank. So glad you didn't use a vacuum cleaner...  :yow
  • Carlsbad, CA
  • 1992 K75s. 2002 Moto Guzzi V11 Scura, 2003 Moto Guzzi V11 LeMans. 2007 Husqvarna TE450

Offline Supershooter

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #3 on: December 14, 2016, 09:08:19 PM »
The previous owner unsuccessfully tried to start the bike in his quest to make a runner out of it. I think he, may have also done some other maintenance before I picked it up, I need to call them back and get a list of what he did for sure, he told me he thought that the fuel pump was the next thing to check on the list when he quit.


The tires look good, the bike has 35,000 miles on it, the local dealer installed a radio and cassette player but mounted it in most perplexing location. I don't understand why would have thought it was a good placement.


I'd like the spark plug cover to be black, too.


Supershooter


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

Offline Laitch

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #4 on: December 14, 2016, 10:26:41 PM »
The previous owner unsuccessfully tried to start the bike in his quest to make a runner out of it.
I think starting the bike is really the only way to make a runner out of it. :hehehe
  • 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.

Offline Supershooter

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #5 on: December 15, 2016, 08:22:09 AM »
I think starting the bike is really the only way to make a runner out of it. :hehehe


In this case not everything that needed to be had been done to make it a runner, since it wouldn't start..
The proverbial cart was in front of the horse  :bmwsmile
  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

Offline Supershooter

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #6 on: December 17, 2016, 09:38:48 PM »
Update:
After noticing the air filter looked new I called the previous owner and he shared some valuable information.
In his attempt to make it a runner again, he and his mechanic friend, changed the air filter, engine oil and filter, cleaned the tank the best he could, added new gas and changed the ignition, removed the lock on the gas tank, due to no keys.
He said the BMW ignition had a 4 position switch and they replaced it with a two position switch due to cost. After that they attempted to start the bike, but it wouldn't start, he said the starter engaged, but it wouldn't fire. He also said they didn't think they could hear the fuel pump run. At this point they quit, and I purchased the bike.


I pulled the plugs last week and they look wet to me, see above pic.


At this point I'm going to pull the fuel pump, and see if it runs... The positive and negative posts are corroded bad, i might have to replace the leads to the pump too. 


I'd sure take some advice on where to go from here.


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

Offline Scud

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #7 on: December 18, 2016, 03:40:50 AM »
Based on your statements, I am suspicious of two things:


Changed ignition.  What does that mean? New coils, new wires, what?


The two-position ignition switch. If the switch is supposed to have 4 positions, something may be wrong.
  • Carlsbad, CA
  • 1992 K75s. 2002 Moto Guzzi V11 Scura, 2003 Moto Guzzi V11 LeMans. 2007 Husqvarna TE450

Offline Laitch

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #8 on: December 18, 2016, 05:47:55 AM »
I'd sure take some advice on where to go from here.
Follow this flow chart. To increase your understanding of how these bikes operate, read all the information that is incorporated into document along with the flow chart. Proceed in an orderly way. Don't make assumptions.
  • 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.

Offline Supershooter

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #9 on: December 18, 2016, 09:08:16 AM »
I should clarify' new key switch not ignition.


The flow chart looks to be a great resource, Thanks


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

Offline Supershooter

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #10 on: December 18, 2016, 03:42:42 PM »
Fuel pump and fuel filter look bad, and wouldn't run when I bumped it with 12V. Where's e best place to buy one?/ cheapest?


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

Offline jakgieger

  • itinerant farmer
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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #11 on: December 18, 2016, 06:14:37 PM »
NOT BMW Dealer for the pump, I got violated  :hehehe there before I found this...  These people are good to work with.
  • 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 Filmcamera

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #12 on: December 19, 2016, 05:36:49 AM »
I haven't tried one of these myself but others on the forum have


https://www.amazon.com/dp/B00T5MKO6Y/ref=cm_sw_r_cp_api_-2bsybJRD823C
  • San Jose, Costa Rica
  • 1991 K100RS 16v ABS1
Poserbricker

Offline MaraudeRS

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #13 on: December 19, 2016, 12:19:20 PM »
I found an exact pump replacement on amazon for $40. After I purchased mine the price went up to $60 but still one of the cheapest for a drop-in


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  • Monterey, CA
  • 1992 K100RS

Offline Laitch

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #14 on: December 19, 2016, 12:29:44 PM »
Fuel pump and fuel filter look bad, and wouldn't run when I bumped it with 12V. Where's e best place to buy one?/ cheapest?
Keep in mind you need more than just the pump; you need the vibration damper and support. You should get another pickup sock or screen, too, depend on the pump width. They don't necessarily come as one unit.
  • 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.

Offline Supershooter

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #15 on: December 19, 2016, 09:02:22 PM »
Thanks for the help guys! I ordered a fuel pump, vibration dampener, screen and a handsiphon pump off of Amazon, with my wife's month long Amazon Prime promo, everything should be here by New Years and maybe Christmas! ($150 shipped) Maybe I'll be able to get it back together yet this year!


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

Offline Supershooter

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #16 on: December 30, 2016, 01:48:21 PM »
The tank is clean,and the fuel pump replaced, so is the next step reassembly and try to start it? Or is there more cleaning and inspecting that needs to be done?
Supershooter
  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

Offline Laitch

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #17 on: December 30, 2016, 01:57:00 PM »
Or is there more cleaning and inspecting that needs to be done?
The spark plugs should be checked or replaced. The valve clearances should be checked so they can be eliminated that as a possible cause of trouble starting. The throttle bodies should then be balanced. The bike can be started now but those tasks need to be completed regardless.
 
  • 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.

Offline Supershooter

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #18 on: December 30, 2016, 08:05:29 PM »
Good news! I have new plugs and a feeler gauge so, all I'll need to figure out is how to balamce the throttle bodies.


After having so much junk in the tank, should I be concerned about the fuel rail or injectors before trying to start it for the "first time"



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

Offline Martin

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #19 on: December 30, 2016, 08:40:46 PM »

You will need a set of 4 vacuum gauges, or make a set using clear tubing and transmission fluid as per Gryph. Do not under any circumstances touch the throttle body screws with the blue paint.
Regards Martin.
  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline Laitch

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #20 on: December 30, 2016, 08:44:04 PM »
all I'll need to figure out is how to balamce the throttle bodies.
After having so much junk in the tank, should I be concerned about the fuel rail or injectors before trying to start it for the "first time"
Junk in the tank means junk everywhere else. Clean up now and chances for success are greater.  :yes
  • 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.

Offline The Mighty Gryphon

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #21 on: December 30, 2016, 08:59:24 PM »
I had just typed a nice write up with a photo of my $10 balancer rig, but the f-ing site nuked the whole thing cause the photo was too big.  After spending the last half hour trying unsuccessfully to resize the frigging photo I'll be damned if I'm going to rewrite the whole post again.

Do a search for "throttle body balancer"  and you should find it in another thread.
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '92K100RS White, '94 K75S Dakar Yellow
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'94 K75S "Cheetos"
'91 K100RS "Moby Brick Too

Offline Laitch

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #22 on: December 30, 2016, 09:05:42 PM »
Do a search for "throttle body balancer"  and you should find it in another thread.
Fergawdsake, look at this thread, Sharpie. Plenty of technique 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.

Offline Supershooter

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  • Posts: 161
Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #23 on: December 30, 2016, 10:13:09 PM »
Laitch, I followed the link and it recommended starting the bike and get it up to operating temp before syncing the throttle bodies... So does the bike need to run to sync the throttle bodies?
Supershooter
  • Liberty Township, O'brien County, Iowa
  • 85 K100 RT

Offline The Mighty Gryphon

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Re: 1985 K100 RT Non Runner to a Runner...I hope
« Reply #24 on: December 30, 2016, 11:05:07 PM »
Throttle sync is the last thing you do before putting the bike on the road.  You need to run the engine at idle for at least 10 minutes to warm everything before you start. 

The first thing you need to do is get it to start.  You have cleaned out the tank and changed the filter in the tank.  The pump runs.  With luck, the only crap in the rail and the injectors will be varnished fuel.  If it's not too bad, a bottle of Techron fuel system cleaner in the tank should get things going, but it might take a week or more of soaking after the first attempt to start.  Then it could take a couple tanks of fuel and Techron to get the engine running smoothly.  That's when you can finally do a throttle sync.  Once you have it rideable  it may take a couple thousand miles to get the full performance from the engine.

Of course if it's really bad, you may have to pull the injectors and clean them with an aerosol can of cleaner and a 9v battery. 

Note: before you attempt to start the engine, make sure you have a charger for the battery.  After any session trying to start you need to immediately recharge the battery for the next session unless you can get the engine to run for at least 15 minutes.  Even then I wouldput the charger on the battery just to insure a good charge for the next try.
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '92K100RS White, '94 K75S Dakar Yellow
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'94 K75S "Cheetos"
'91 K100RS "Moby Brick Too

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