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Author Topic: Austin Texas 85 k100rs build  (Read 83150 times)

Offline Laitch

  • Faster than a speeding pullet
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Re: Austin Texas 85 k100rs build
« Reply #75 on: January 24, 2016, 07:56:51 PM »
Save the rainforests!
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline toddlmr

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Re: Austin Texas 85 k100rs build
« Reply #76 on: January 25, 2016, 06:07:15 PM »
Got it back together today. It wouldn't start so I pulled the plugs, cleaned them, and made sure wires were on correctly. It fired up and I let it idle for a bit. I was able to get it running good enough to take it to the gas station. It ran pretty rough. I filled it up with 3 gallons of gas. I took it over to the next town (it ran better) and got some fuel cleaner. They didn't have techtron so I bought Seafoam. I put 4 oz in it and ran it toward home with a 10 mile detour. I got back and wanted to fix a few things. The throttle is not very  snappy and seems to bind. I took it apart (Dear lord this is over engineered!) and cleaned up all the  components. Pulling on the cable it is harder effort than I'd expect but it it does snap back. Lubed all back together and it is better but it seems to come back down to idle slow, it will stumble at about 800 rpms, then catch up and idle about 1100. I'm wondering if it is still just problems with dirty injectors? Almost seems like it may have a vacuum leak. Also, when going up a hill or from a stop it seems to spark knock (premature ignition sound) I'm happy to  have it running  and am getting closer!!!!!
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  • austin, tx
  • 1985

Offline Martin

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Re: Austin Texas 85 k100rs build
« Reply #77 on: January 25, 2016, 07:13:16 PM »
Todd BMW tells you not to lubricate the cables but I do. About thirty years ago I was given a sample can of Tri Flow PTFE based lubricant, it is brilliant on cables. You can now get it from bicycle shops.
Regards Martin.
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  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline rbm

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Re: Austin Texas 85 k100rs build
« Reply #78 on: January 25, 2016, 07:43:33 PM »
Your '85 throttle cable is the earlier design, with the adjuster in the middle of the cable instead of at the throttle perch.  Can you confirm? Stickiness in the throttle can be isolated to either the throttle cable or the throttle tube.  Remove the cable and test the throttle operation.  If the throttle tube rotates freely and with little slop, then turn your attention to the cable.  Make sure it is routed as directly as possible and that there are no severe bends in it.  You might want to replace the original cable with a newer design, with the adjuster at the perch.
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  • Regards, Robert
Toronto, Ontario

1987 K75 - Build Blog @http://k75retro.blogspot.ca/

Offline toddlmr

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Re: Austin Texas 85 k100rs build
« Reply #79 on: January 25, 2016, 08:27:56 PM »
I read tonight about the breather hose and went out and looked at mine... Bad shape. That might be part of my running issue...
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  • austin, tx
  • 1985

Offline toddlmr

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  • Posts: 87
Re: Austin Texas 85 k100rs build
« Reply #80 on: January 25, 2016, 08:28:30 PM »
Quote from: rbm on January 25, 2016, 07:43:33 PM
Your '85 throttle cable is the earlier design, with the adjuster in the middle of the cable instead of at the throttle perch.  Can you confirm? Stickiness in the throttle can be isolated to either the throttle cable or the throttle tube.  Remove the cable and test the throttle operation.  If the throttle tube rotates freely and with little slop, then turn your attention to the cable.  Make sure it is routed as directly as possible and that there are no severe bends in it.  You might want to replace the original cable with a newer design, with the adjuster at the perch.
There is only an adjuster at the top by throttle assembly.
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  • austin, tx
  • 1985

Offline rbm

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Re: Austin Texas 85 k100rs build
« Reply #81 on: January 25, 2016, 08:32:08 PM »
Ok, so the cable has been replaced with a newer one, good.  Try and isolate the problem to the failing part as I outlined above.  The throttle should be fairly responsive, so sluggishness is a problem.
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  • Regards, Robert
Toronto, Ontario

1987 K75 - Build Blog @http://k75retro.blogspot.ca/

Offline The Mighty Gryphon

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Re: Austin Texas 85 k100rs build
« Reply #82 on: January 25, 2016, 08:41:23 PM »
Get some self bonding tape and wrap a couple layers around the cracks in the breather hose.  That will tell you if that is the problem, and get you running while you get a new hose.  You will have to take the hose off to wrap it.
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  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline rbm

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Re: Austin Texas 85 k100rs build
« Reply #83 on: January 25, 2016, 08:45:02 PM »
Gryph, Do you think painting the hose with Liquid Electrical Tape would work?
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  • Regards, Robert
Toronto, Ontario

1987 K75 - Build Blog @http://k75retro.blogspot.ca/

Offline toddlmr

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Re: Austin Texas 85 k100rs build
« Reply #84 on: January 25, 2016, 08:51:03 PM »
Quote from: rbm on January 25, 2016, 08:45:02 PM
Gryph, Do you think painting the hose with Liquid Electrical Tape would work?
I got some hose (10 foot) of it.
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  • austin, tx
  • 1985

Offline Laitch

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Re: Austin Texas 85 k100rs build
« Reply #85 on: January 25, 2016, 09:42:59 PM »
.
Quote from: The Mighty Gryphon on January 25, 2016, 08:41:23 PM
Get some self bonding tape and wrap a couple layers around the cracks in the breather hose.  That will tell you if that is the problem, and get you running while you get a new hose.  You will have to take the hose off to wrap it.
A couple of things.
If you're talking about the vent hose, sealing the outside won't prove much if the inside diameter has been compromised by material degrading and deposits. As far as a length of hose, it's too difficult to make those bends without restricting air flow. The OEM part with molded bends will work right and doesn't cost much.

Be sure the flange on the throttle grip isn't pushed slightly past the inboard edge of the throttle perch and rubbing on the gear housing. Doesn't take much to slow things down. The throttle should snap back when released.
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline toddlmr

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Re: Austin Texas 85 k100rs build
« Reply #86 on: January 27, 2016, 06:53:41 PM »
Quote from: Laitch on January 25, 2016, 09:42:59 PM
.
Quote from: The Mighty Gryphon on January 25, 2016, 08:41:23 PM
Get some self bonding tape and wrap a couple layers around the cracks in the breather hose.  That will tell you if that is the problem, and get you running while you get a new hose.  You will have to take the hose off to wrap it.
A couple of things.
If you're talking about the vent hose, sealing the outside won't prove much if the inside diameter has been compromised by material degrading and deposits. As far as a length of hose, it's too difficult to make those bends without restricting air flow. The OEM part with molded bends will work right and doesn't cost much.

Be sure the flange on the throttle grip isn't pushed slightly past the inboard edge of the throttle perch and rubbing on the gear housing. Doesn't take much to slow things down. The throttle should snap back when released.
I replaced (well repaired) cracked crankcase breather. It wasn't bad at all, just a small crack. I wrapped it with black tape and am ordering a new one. It does idle a little better. It is still wanting to stall on deceleration. As a matter of fact, it does stall out. I rodw it 45 miles today. Also, it sure does vibrate in the seat. Bars aren't bad. I also noticed it is loud. I don't know why I just noticed but it sounds like it doesn't have much baffle. It backfires on decel through the exhaust. Seems as though no baffle would make it run rough too. (Sounds good). I am thinking about finding a couple vacuum gauges and check on carb sync. I'll post more after dinner.
Thanks!
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  • austin, tx
  • 1985

Offline Laitch

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Re: Austin Texas 85 k100rs build
« Reply #87 on: January 27, 2016, 07:15:47 PM »
I thought that putting the red lights in the instrument cluster would have fixed all this; you just never know.

You've raised this thing from the dead, todd, so I'd say it's going pretty good. The idle quirk has been with you from the beginning. You haven't removed the injectors or cleaned the throttle bodies yet, have you? My speed reading isn't at it's peak after 6am. You probably should send out those injectors for cleaning before you balance the throttle bodies seeing as how the whole bike bike was neglected for who-knows-how-long and running fuel that looked like maple syrup probably before that.
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline toddlmr

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Re: Austin Texas 85 k100rs build
« Reply #88 on: January 27, 2016, 07:21:48 PM »
Quote from: Laitch on January 27, 2016, 07:15:47 PM
I thought that putting the red lights in the instrument cluster would have fixed all this; you just never know.

You've raised this thing from the dead, todd, so I'd say it's going pretty good. The idle quirk has been with you from the beginning. You haven't removed the injectors or cleaned the throttle bodies yet, have you? My speed reading isn't at it's peak after 6am. You probably should send out those injectors for cleaning before you balance the throttle bodies seeing as how the whole bike bike was neglected for who-knows-how-long and running fuel that looked like maple syrup probably before that.
Good point... Can I clean them?
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  • austin, tx
  • 1985

Offline K1300S

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Re: Austin Texas 85 k100rs build
« Reply #89 on: January 27, 2016, 07:27:36 PM »
Send them out. 





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Project Thread "K75s Midlife Refresh"
http://www.motobrick.com/index.php/topic,7810.0.html

Offline toddlmr

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Re: Austin Texas 85 k100rs build
« Reply #90 on: January 27, 2016, 07:29:46 PM »
Quote from: mlytle on January 27, 2016, 07:27:36 PM
Send them out. 
How much? How long does it take?
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  • austin, tx
  • 1985

Offline toddlmr

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Re: Austin Texas 85 k100rs build
« Reply #91 on: January 27, 2016, 10:10:58 PM »
I thought about replace intake seals...  man they are expensive...
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  • austin, tx
  • 1985

Offline Laitch

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Re: Austin Texas 85 k100rs build
« Reply #92 on: January 27, 2016, 10:30:40 PM »
Have you been traveling this path, todd?
http://www.motobrick.com/index.php?topic=624.0
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline K1300S

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Re: Austin Texas 85 k100rs build
« Reply #93 on: January 27, 2016, 10:41:40 PM »
Quote from: toddlmr on January 27, 2016, 07:29:46 PM

How much? How long does it take?

they turn them around in less than a day, so time depends on how fast you want to ship.  price is about 20-25 bucks each.  worth it.  they don't just clean, they replace all the plastic bits, put on new orings and test.  i send all my race car injectors there.  been using RC for many years.
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Offline toddlmr

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Re: Austin Texas 85 k100rs build
« Reply #94 on: January 28, 2016, 11:09:18 AM »
Anyone use these osidetiger.com replacement injectors? They claim to have a better pattern and give better power.
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  • austin, tx
  • 1985

Offline Martin

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Re: Austin Texas 85 k100rs build
« Reply #95 on: January 28, 2016, 11:33:08 AM »
Todd apparently the 4 hole injectors are supposed to be a lot better, off 318I BMW car  or possibly a 4.9 cu in Ford. I have been chasing information. but can't as yet get any solid comparison with proper data. I believe they are available from osidetiger.com.
Regards Martin .
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  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline toddlmr

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Re: Austin Texas 85 k100rs build
« Reply #96 on: January 28, 2016, 11:37:38 AM »
Quote from: Martin on January 28, 2016, 11:33:08 AM
Todd apparently the 4 hole injectors are supposed to be a lot better, off 318I BMW car  or possibly a 4.9 cu in Ford. I have been chasing information. but can't as yet get any solid comparison with proper data. I believe they are available from osidetiger.com.
Regards Martin .
Yes... They are $100 for all 4. Better deal for new.
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  • austin, tx
  • 1985

Offline Bill

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Re: Austin Texas 85 k100rs build
« Reply #97 on: January 28, 2016, 11:44:52 AM »
In the engine>fuel system there is a thread of one who has done them and likes them ....

I'd link it to you if I could figure out how.
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  • Sutton, Ontario, Canada
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86 K100 R-?L?T parts collection in loose formation...

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72 CB750

Offline Martin

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Re: Austin Texas 85 k100rs build
« Reply #98 on: January 28, 2016, 11:45:17 AM »
Todd if you go with osidetiger, could you see if you can find what the exact models these are off, they do not ship to OZ. Have tried a couple of local injector places, and they don't want  know about it, not interested at all.
Regards Martin.
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  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline jakgieger

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Re: Austin Texas 85 k100rs build
« Reply #99 on: January 28, 2016, 12:57:41 PM »
I have used them.  They appear to work well (2500 mi so far).  I am not an expert, but I think that the people at osetiger are qualified :bmwsmile...at least I hope so.
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  • 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."
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