K11 Owners Group

RedBrickRider · Posted: Sun Mar 20, 2011 5:56 pm Post subject: K1100LT bogs down???

Ok, here't the problem... Lately when riding my 1993 K1100LT, it will suddenly bog down and hardley run. Full throttle will only get you to about 55 mph. After a mile or two it will just as suddenly go back to running correctly. So far I've replaced the fuel filter and installed a fuel pump tune up kit. I rode 250 miles yesterday. At about 170 miles into the ride, it started acting up. After a mile or so it started running good again, and ran great the rest of the day. Any Ideas???? sugestions???? This is driving me crazy. Thanks in advance for any help.
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Lifes too short to ride an ugly Motorcycle

Ted · Posted: Sun Mar 20, 2011 6:19 pm Post subject:

Quick way to troubleshoot a dying pump - Next time it happens give the side of the tank a good thwack - not hard enough to dent the aluminum, just enough to jar it (and the pump.) When pumps start to go bad often they will bog down or simply stop suddenly, and early on when this starts happening a good jar will often bring them instantly back to life. As you can guess, the behavior steadily gets worse and the thwacks stop working.
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Ted

KOG#1

Mystic Red · Posted: Sun Mar 20, 2011 7:30 pm Post subject:

Scott_Anderson · Posted: Sun Mar 20, 2011 9:31 pm Post subject:

When was the fuel filter changed last? Could be indications of plugging up.
_________________
Ride safe.

1995 K1100LT 0302044
2017 FLHTK Ultra Limited
Garmin StreetPilot 2820
Garmin Zumo 550
Garmin Zumo XT
"One who does not ask questions is ashamed to learn" Danish proverb
1997 K1100LT 0302488(R.I.P.)
1997 R1100RT ZC62149(sold)

RedBrickRider · Posted: Sun Mar 20, 2011 10:22 pm Post subject:

RI Parker · Posted: Mon Mar 21, 2011 10:15 am Post subject:

Kinked fuel line? Water in the gas? Tank vent line clogged? Something clogging the fuel inlet inside the tank?

(Maybe this will never happen but) what if you take weight off of the seat as it's sputtering? Mine had something causing pressure on the motronic and it would run smoothly while I was standing on the pegs. (Hope this isn't it, because it's costly.)
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RIP (Roy Parker)

1997 K1100LT w/ 87,000 mi
(aquired just before the snow of 12/21/09.)

Flying Duck · Posted: Mon Mar 21, 2011 10:18 am Post subject:

Flaky fuel tank connector?

Flaky side stand switch or connnector?
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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

wedge · Posted: Mon Mar 21, 2011 2:00 pm Post subject:

Flying Duck · Posted: Mon Mar 21, 2011 3:19 pm Post subject:

Check battery terminals, spark plug and coil connections.
_________________
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

jarnbak · Posted: Mon Mar 21, 2011 8:08 pm Post subject:

Had the same problem ones on my k11lt.It was a bad connection at a fuel
injector.
regards Palle.

RedBrickRider · Posted: Tue Mar 22, 2011 7:41 pm Post subject:

UPDATE!!!! I went for a ride today and it started the same old thing. Ran like crap, then good, then like crap... I just happened to catch it when it was running bad. I put the bike on the centerstand, and checked the header pipes. #1 hot #2cold #3cold #4 hot. Ok, its only running on two cylinders. Why??? My guess is a coil going bad. Anyone else have an idea please chime in.....
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Lifes too short to ride an ugly Motorcycle

SugarHillCTD · Posted: Tue Mar 22, 2011 8:26 pm Post subject:

YES

The coils are paired. 1&4 and 2&3.

A K550LT must be a DOG, eh?

Looks like FD wins the prize for his diagnosis Very Happy

_________________
John & Cathy

'92 K100RS4V Pearl White SOLD
'04 K1200GT
IBA Several-SS1k, BBG, 50CC NYC to S.F.

Scott_Anderson · Posted: Tue Mar 22, 2011 9:59 pm Post subject:

I had a similar situation a few years ago. Only running on outside 2 of the 4. Difference being it happened all at once.

Ended up being a couple of bad valves in the center 2 cyl at the same time. Shocked

_________________
Ride safe.

1995 K1100LT 0302044
2017 FLHTK Ultra Limited
Garmin StreetPilot 2820
Garmin Zumo 550
Garmin Zumo XT
"One who does not ask questions is ashamed to learn" Danish proverb
1997 K1100LT 0302488(R.I.P.)
1997 R1100RT ZC62149(sold)

dwerbil · Posted: Tue Mar 22, 2011 10:01 pm Post subject:

wedge · Posted: Wed Mar 23, 2011 10:07 am Post subject:

Fortunately on off on off sounds more like a coil. I'd go for cleaning the earth first.
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Bikes:
93 K75S
93 R1100RS

Manhattan Rider · Big Brick Rider Joined: 09 Nov 2009 Posts: 69

One other thing to check. K1100LTs are notorious of cracked exhaust pipes where the four pipes weld into one near the left foot peg. A good welder capable of welding stainless steel can fix the problem. I've had mine crack three times in my 140,000 miles of ownership. I've also had the front exhaust nuts to the head come loose resulting in a blown exhaust gasket. In each case, the overly lean condition sensed by the 02 senor results in the kind of cutting out that your experiencing. In essense, the lean condition is outside the range of the sensor.

I've also had this problem occur when the crankcase breather hose to the air filter box cracked. It's easy to identify sense you will usually see an oily film on the outside of the hose. If you pull off the left side panel, you can see the hose running to the airbox by looking just in front of the fuse panel. If its oily, its cracked.

http://k11og.org/forum/viewtopic.php?p=30245&sid=f9b4335a3ebf01fe6c4feddc064c7384
_________________
Ken Krumm
Manhattan, Kansas
2014 BMW R1200GSA
1996 BMW K1100LT
1996 BMW R1100RT
2004 BMW R1150GS
BMW 500,000 Mile Award
2004 Ducati ST3
1974 Norton 850 Commando Roadster
1969 BSA 441 Victor Special

RedBrickRider · Posted: Wed Apr 13, 2011 6:20 pm Post subject: UPDATE

I think I've got it... 300 miles since Sunday, and the bike runs great.

I replaced:

1. Fuel pump
2. Fuel strainer
3. Fuel filter
4. Fuel pump damper and all attached parts
5. Fuel lines

Total cost: $323.00 Parts supplied by: Euro Moto Electrics & Beemer Boneyard.

Very Happy

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Lifes too short to ride an ugly Motorcycle