K11 Owners Group

RAL88 · Last edited by RAL88 on Sun Nov 15, 2009 3:44 pm; edited 1 time in total

Ok, so last week I was driving into work. No problems with stop and go traffic early then mostly highway and then stop and go again in the city. When I got to the city I found that the bike was idling really rough and if I tried to gun it it would hesitate and try to cut out. The impression that it gave me is that it was not running on all cylinders. I had to over rev it to get moving so it would have the power to start moving and not stall. On the way home in the city I had the same problem. On the highway I had no problems with it running, I had acceleration and I got 49mpg. Of course the bike was running above 2000 rpm the entire time on the highway. When I got near home and stop and go traffic the problem was gone.

Today I took the bike out for about an hour and half. No problems until I got about 2 miles from home and then it started doing the same thing. I let the bike rest and restarted and it still had hesitation and no power until it got to about 2000rpm. Also if I rev it fast in neutral the rpms go up but if I backoff on the throttle quickly it stalls.

I changed out the fuel filter because it was easy but this changed nothing. I also pulled the spark plugs and they looked fine with no fouling.

Any ideas or suggestions would be much appreciated.

Thanks,
_________________
Rich

"If it ain't broke, take it apart and make it work better"
*************
'96' K1100LT-SE
'97' R850GS-R

Flying Duck · Posted: Sun Nov 08, 2009 11:21 pm Post subject:

Air leak at the TBs? (Spray a little starter fluid around there and see if RPMs increase.)

If there's a leak sometimes the vacuum of higher RPMs will cause the leak to seal. Hence why it works fine at higher RPMs but not lower.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

RAL88 · Posted: Mon Nov 09, 2009 11:05 pm Post subject:

Just picked up some starter spray. I'll give that a shot and see where it leads.

Thanks,
_________________
Rich

"If it ain't broke, take it apart and make it work better"
*************
'96' K1100LT-SE
'97' R850GS-R

Wrigsby1 · Posted: Tue Nov 10, 2009 12:43 pm Post subject:

Possibly coil. Buy a used one and try it in either position. I had a similar fault and it was a pain to find as it was so temperamental. You only need one as they are interchangeable.

PS I just fixed the duff rubber manifolds and this gave a rough tickover but didn't make anything over 1250rpm a problem. Push down on the throttle bank is a check on that one as it "closes" the cracks!

I still guess coil.

Flying Duck · Posted: Tue Nov 10, 2009 12:47 pm Post subject:

markmack · Posted: Tue Nov 10, 2009 4:15 pm Post subject:

I've heard of a problem like this in mid-range rpm. It was a bad throttle position sensor. You may want to check it with a multi meter.
_________________
markmack
R100RT 1979..First road bike, spoiled me on BMW's and a touring fairing, moved had to sell.
K75C ..Spoiled me on the K motor, smooth, sold.
K1100LT 1993..Best tour bike for me.
K1200LT 2003..Happy wife..Happy life.

RAL88 · Posted: Sat Nov 14, 2009 4:56 pm Post subject:

Tried starter fluid around the TB boots with no change. I picked up a coil and am waiting for it to come in. I'll see what that does.
_________________
Rich

"If it ain't broke, take it apart and make it work better"
*************
'96' K1100LT-SE
'97' R850GS-R

RAL88 · Posted: Sun Nov 15, 2009 3:56 pm Post subject:

Ok so its a beautiful day here and I'm working on the bike. The symptoms seem to me to be a vacuum problem so I pull out my Carbtune and check the vacuum at the throttle bodies and its fine. I check anywhere I think that I may have a break in the vacuum hose, nothing.

Then I remember reading an article about someone who had some rough runnig issues and he solved them my diconnecting the battery. Others had responded that the brain holds and remembers the good, bad, and ugly of readings its taken earlier and if it has a glitch or error it could cause the bike to run rough. So I disconnect the battery and while I have it disconnected I figured I would take it down to have it tested. It is a 5 year old Odysee that I have always kept on the Battery Tender and it checked out fine. I waited about a half hour, put it back in and took the bike out for a long ride and the bike runs great. Now I believe in the saying "If it's too good to be true it probably isn't" so I will ride the bike this week and hope for the best and expect the worst until I feel that this may have fixed the problem.

I still have a set of coils on the way just in case,
_________________
Rich

"If it ain't broke, take it apart and make it work better"
*************
'96' K1100LT-SE
'97' R850GS-R

Tim (Midland Section) · Posted: Sun Nov 15, 2009 7:39 pm Post subject:

Phil Marvin · Posted: Sun Nov 15, 2009 10:30 pm Post subject:

[quote="Tim (Midland SectionYou are indeed correct. The ECU has a base programme to let the bike run. Over time this may get corrupted, disconnection allows the settings to be reloaded from ROM. To set it up after battery disconnect, one should turn on the key, but DO not start, then open & close the throttle fully a few times. This teaches the ECU max & min TPS values. After starting the ECU continues to learn & refine especially if your bike has a lambda sensor.
HTH[/quote]

Hi, Tim,
I've heard that, for Motronic-equipped bikes (K1100, R1100, etc.), this is correct. For K-Jetronic bikes (K100 2-valve, K75), it does absolutely no good. Of course, I could have heard wrong! Also, Rich's bike is a 1985 model, an early 2-valve. None of the 2-valve K-bikes (K75 or K100) had the lambda sensor (known on this side of the pond as the oxygen sensor).
_________________
Ride Safe,
Phil Marvin in El Paso, TX
'94 K75A/3
'95 K75RTP

RAL88 · Posted: Mon Nov 16, 2009 6:57 am Post subject:

Hey Phil,

Sorry, I did not mention that it was my 96 K11 that was having the problem not the 85. The 85 runs like a champ and so far so good now so does the 96. Still not used to having two K bikes.
_________________
Rich

"If it ain't broke, take it apart and make it work better"
*************
'96' K1100LT-SE
'97' R850GS-R

RAL88 · Posted: Fri Nov 20, 2009 2:03 pm Post subject:

Well I went for a nice long ride this morning and the bike ran great. Actually it must have been riding at less than 100% before because I can really feel the diference now from what it was before the power loss.

There must have been a lot crap cluttering up the brain. I think from now on every spring I am going to disconnect the brain and let all the crap in the memory disappear.
I think I will do that with the bike also. Wink

_________________
Rich

"If it ain't broke, take it apart and make it work better"
*************
'96' K1100LT-SE
'97' R850GS-R

Phil Marvin · Posted: Fri Nov 20, 2009 5:50 pm Post subject:

Scott_Anderson · Posted: Fri Nov 20, 2009 7:04 pm Post subject:

RAL88 · Posted: Fri Nov 20, 2009 8:23 pm Post subject:

And HM can't come soon enough!
_________________
Rich

"If it ain't broke, take it apart and make it work better"
*************
'96' K1100LT-SE
'97' R850GS-R