K11 Owners Group

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

I purchased my K1100LT new in 1996 and it now has 154,000 miles. Over the last couple of years, my K1100LT has suffered from intermittent cutting out. In the past, the problem was cracked exhaust at the 4 into 1 or an exhaust gasket leak at the head, causing the 02 sensor to give a false signal. After several welds and a second exhaust, I switched to a REMUS two piece exhaust system. I then started having the same problem caused by cracked vacuum hoses and sealing to the injection rail. So, all the rubber hoses were replaced. It ran great all summer.

Now it acting up again. This summer, while in the middle of the Colorado Rockies, my GS fried the halls sensor. Three summers back, my RT fried it’s halls sensor on the north shore of Lake Superior. Each time, it was an intermittent cutting out. It would run great for several weeks and then start cutting out for no reason. For each bike, I went through the usual cleaning of all the connectors, draining the fuel tank and changing the fuel filter, fuel injector cleaner, lose wires, check battery, changed the sending unit in the gas tank, etc. Usually to no avail. At the most inopportune time, the hall sensor fries (usually during the rare moment when my wife is travelling as a passenger). She never seems to be amused.

So my question is has anyone else experience a halls sensor failure on a K1100LT? I’ve always thought this was an oilhead issue due to higher air cooled engine heat drying out the wiring. This bike is no spring chicken; none of them are anymore. Replacing seems to be simple enough. The price for the Bosch halls sensor on BMW Eurosport is about $350. Cheaper than the highly overpriced BMW sensor at $500. Still overpriced.

I still plan on taking another look at the side stand sensor, fuel tank connection and motronic connection. But I’m leaning toward just replacing this sensor due to its age. I don’t plan on selling this bike and who knows how long these parts will be available. Thoughts?
_________________
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

SugarHillCTD · Posted: Thu Dec 06, 2012 4:44 pm Post subject:

Ken,

Have you warmed the bike up then tried the HE hairdryer test?

John
_________________
John & Cathy

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

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

SugarHillCTD · Posted: Thu Dec 06, 2012 5:02 pm Post subject:

Remove the Hall Effect Sensor cover (front of engine, right side)

Might want to run the engine up to normal operating temps.

With the engine running, take a high heat hairdryer or heat gun and aim it at the sensor.

If the HE Sensor is faulty, this should duplicate the problem.

Good luck.
_________________
John & Cathy

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

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

I removed the plastic and removed the Hall Effects Sensor cover. I warmed the bike up until the fan came on and then put my heat gun on the sensor. It worked....the bike started cutting out. Looks like a simple remove and replace.

I called the head mechanic at my BMW dealer and he told me that using a heat gun on the halls is the test they use on their triumphs. For the BMWs, they use an ohms test using their specialty BMW diagnostics equipment. Either way, he confirmed your method and the test results.

Thanks for the great tip.
_________________
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

Number 6 · Posted: Fri Dec 07, 2012 1:24 am Post subject:

It is a "usual" problem, heat dependant so often you can restart the bike after 10 minutes but it'll only get worse. if you ignore it

You can also test it in static mode, here is how, you need a 12V (or less, 9V is fine) power supply, here red is +12, black is ground.

If you set the plug like in the picture (lone pin at bottom), plug ground on the top left pin and +12V on the top right pin. Then the + side of the voltmeter to +12V and the - side at the output of one of the sensors, one of the free pins except the lone bottom one.

As is, I have 14.06V and with a small spoon between the sensor and magnet it drops to 0V, the sensor is OK.
The other sensor, again 14.05V

The spoon drops again the signal to 0 (slightly oscillating to 0.02V) the other sensor is OK too.

You can then heat it and check again.

If you are intested you can buy the sensors as electronic parts and replace them, I have some spare ones just in case but never needed them yet.
_________________
I am not a number, I am a free man.

94 K1100LT

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

I purchased a new Bosch halls effects sensor from Euro Motoelectrics out of Denver yesterday http://www.euromotoelectrics.com/ and should have it in a couple days.

Since I have three older BMW that have all had halls sensor issues and I don't plan on selling any of them, I am interested in the knowing where I can purchase the parts to repair them. Please provide.
_________________
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

Rafal · Posted: Fri Dec 07, 2012 10:45 am Post subject:

Hello!

Try to go follow this
http://www.ebbo.org/2av54.php.
The sensor it self is general purpose part, so finding the manufacture and reference number should be enough.

Best regards,
_________________
Rafal
K1100RS is a real beast (in Marrakesh Red)
K75S is a real beauty - she has gone Sad

, but not to far Smile

.

Number 6 · Posted: Fri Dec 07, 2012 11:21 am Post subject:

I bought 5 units of CYHME56 from http://www.chenyang.de for about $80 2 years ago.
_________________
I am not a number, I am a free man.

94 K1100LT

Inge K. · Posted: Fri Dec 07, 2012 4:20 pm Post subject:

Another source to replacement sensors: http://www.bbautomacao.com/home_hall_effect_sensor_cyhme56.html

Inge K.

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

Thanks for all the help. I paid $360 for a new Bosch unit. I will repair the old halls sensor just to have on the shelf.
_________________
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