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lexxol Brick Rider
Joined: 20 Mar 2009 Posts: 39 Location: Venice Fl
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Posted: Thu Jan 28, 2010 8:27 pm Post subject: Throttle Position Sensor ( TPS ) what does it do? |
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I have read how to adjust the TPS etc. However I am unclear as to it's function. I can't lower my idle RPMs ( 1500 rpms ) would resetting the TPS help this? This is on my 87 K75.
Thanks in advance. _________________ 1995 K1100rs
1987 k75/Pichler fairing |
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Tim (Midland Section) Flying Brick Rider

Joined: 08 Apr 2005 Posts: 960 Location: Pinxton, Nottingham, England.
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Posted: Thu Jan 28, 2010 8:35 pm Post subject: |
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TPS determines when to shut off / open the injectors. i.e. throttles shut, no petrol. If incorrectly set, fuel sent when not needed, resulting in bangs in the exhaust.
Tickover is set when balancing the throttles. If it's sitting @ 1500 then you have an air leak or it desperately needs the throttles balancing.
HTH _________________ Regards Tim,
Grey haired riders don't get that way by pure luck
1996 Guzzi Cali3 LAPD
1972 750 Commando
G6HRN
#485 |
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Flying Duck PsyKotic Waterfowl

Joined: 27 Jan 2005 Posts: 10102 Location: Bumf***, WA
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Posted: Thu Jan 28, 2010 8:44 pm Post subject: |
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On K75s and K100s there is very little rotational play in the throttle position switch (it's only a switch on those bikes) and if it's positioned improperly it will hold the throttle open. I knocked one out of place on a K75 I was building and wasted almost a whole afternoon before I discovered the TPS was holding the throttle open. DOH!
Loosen the screws on it and see if that helps. Properly adjusted on a K75 you should hear a click when any throttle is applied. _________________ 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 |
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Freedom45 Big Brick Rider
Joined: 19 May 2010 Posts: 71 Location: Phoenix, AZ
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Posted: Mon Jun 06, 2011 2:50 am Post subject: |
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What is the correct method of setting the switch on K1100s?
Thanks for your response(s). _________________ 1996 K1100RS SE, K1100K, K75S, Laverda 1200
MOA 9900
IBA #70 NRA |
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Number 6 Flying Brick Rider

Joined: 05 Feb 2011 Posts: 481 Location: Paris area, France
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Posted: Mon Jun 06, 2011 5:22 am Post subject: |
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| Freedom45 wrote: | What is the correct method of setting the switch on K1100s?
Thanks for your response(s). |
It is not a switch on K11, it provides a precise angular position to the motronic.
Here is how to set it up: http://www.largiader.com/articles/motronic.html
For full sync: throttle body sync _________________ I am not a number, I am a free man.
94 K1100LT |
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Scott_Anderson Site Admin
Joined: 05 Sep 2006 Posts: 3122 Location: Central Iowa, USA
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Posted: Mon Jun 06, 2011 7:22 am Post subject: |
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Lexxol, something you should check for is a vacuum leak.
One of those sneaky buggers will raise your idle.
Check your hoses for cracks, or a loose fit. _________________ 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) |
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Ernie-NH Flying Brick Rider
Joined: 14 Oct 2009 Posts: 982 Location: Bristol, New Hampshire
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Posted: Mon Jun 06, 2011 3:19 pm Post subject: |
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Good afternoon all..
Hey... while the original post was a TPS question, I noticed on my return ride from HMSP-IV that whenever I'd hit a "bridge/road" transition strip that was raised, the shock would cause the throttle to "die" just a tad and then resume. This made riding a bit uncomfortable especially where road construction was quite uneven. Could this possibly be the symptom of a faulty TPS or TPS setting ? ,,,, or does it have nothing to do with the TPS ?
Thanks in advance for any input...
Best regards........// Ernie in NH _________________ AMA,, American Deaf Bikers
Airhead Beemers Club
'11 G650gs
'95 K1100LT
'76 R100/7 |
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Jim Site Admin

Joined: 17 May 2003 Posts: 3841 Location: WHERETHEFUNNEVERENDS
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Posted: Tue Jun 07, 2011 2:02 am Post subject: |
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Ernie - check the fuel pump connector plug on the left side. My bike was cutting out occasionally - Scott_ mentioned that connector - I cleaned it and haven't had any trouble since. After that, check all the connectors you see. I use Deoxit or CorrosionX. _________________ Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000
"We shall not all die, but we shall all be changed." |
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Jeeves Big Brick Rider
Joined: 25 Apr 2011 Posts: 72 Location: Vancouver Island,B.C. Canada
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Posted: Tue Jun 07, 2011 12:39 pm Post subject: |
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| Jim wrote: | | Ernie - check the fuel pump connector plug on the left side. My bike was cutting out occasionally - Scott_ mentioned that connector - I cleaned it and haven't had any trouble since. After that, check all the connectors you see. I use Deoxit or CorrosionX. | i just had the same problem on my k75 and as i have the k11 now the k75 won't even talk to me ,,back to the prob it would cut out without a bump and my dash lights would come on,,,i would turn key off and on until dash light went from dim to bright and bike would start indicating ignition prob,,, however after electrical play time it turned out to be that very plugin mentioned by Ernie just unplugged it during my check and plugged it in and end of problem and the plug LOOKED perfect,, my bmw buddy also said that part of the ground prob thru starter could cause trouble Jeeves _________________ K1100 RS 1993,the fast mystic red one with the burnished gold stuff
K 75 C 1986 black,naked and collector plate
R 75/5 1971 black naked and beautiful and under construction,,but getting closer by the day |
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Ernie-NH Flying Brick Rider
Joined: 14 Oct 2009 Posts: 982 Location: Bristol, New Hampshire
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Posted: Tue Jun 07, 2011 12:41 pm Post subject: |
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Good morning Jim...
Thanks for the input... do you mean the 4-wire "connector plug" that exits the tank ? On mine, its not on the left side, but rather connects to the 'female' end coming out of the harness on the right-side just below and it=n from of the Motronic. The "little hesitation" that I mentioned is like a momentary deceleration and then just as quickly it resumes to the correct speed. Was that the type of problem you experienced as well ? Will "Deoxit" at any rate... good advice !
Best regards and Ride Safe !!.........// Ernie in NH _________________ AMA,, American Deaf Bikers
Airhead Beemers Club
'11 G650gs
'95 K1100LT
'76 R100/7 |
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Jeeves Big Brick Rider
Joined: 25 Apr 2011 Posts: 72 Location: Vancouver Island,B.C. Canada
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Posted: Tue Jun 07, 2011 12:45 pm Post subject: |
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| Ernie-NH wrote: | Good morning Jim...
Thanks for the input... do you mean the 4-wire "connector plug" that exits the tank ? On mine, its not on the left side, but rather connects to the 'female' end coming out of the harness on the right-side just below and it=n from of the Motronic. The "little hesitation" that I mentioned is like a momentary deceleration and then just as quickly it resumes to the correct speed. Was that the type of problem you experienced as well ? Will "Deoxit" at any rate... good advice !
Best regards and Ride Safe !!.........// Ernie in NH | my connector is exactly where you said yours is on right side but with some slack there could maybe be threaded the other way,,yes 4 pin conn. Jeeves _________________ K1100 RS 1993,the fast mystic red one with the burnished gold stuff
K 75 C 1986 black,naked and collector plate
R 75/5 1971 black naked and beautiful and under construction,,but getting closer by the day |
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Ernie-NH Flying Brick Rider
Joined: 14 Oct 2009 Posts: 982 Location: Bristol, New Hampshire
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Posted: Tue Jun 07, 2011 12:47 pm Post subject: |
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Hi Jim... Hi Jeeves...
My faulty spelling,,, sorry !
""just below and it=n from of the Motronic""... should read:
"" just below and in front of the Motronic""
I promise, I'll try to do better with the keyboard and not be so hasty !!
Regards again........// Ernie in NH _________________ AMA,, American Deaf Bikers
Airhead Beemers Club
'11 G650gs
'95 K1100LT
'76 R100/7 |
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Jeeves Big Brick Rider
Joined: 25 Apr 2011 Posts: 72 Location: Vancouver Island,B.C. Canada
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Posted: Tue Jun 07, 2011 12:49 pm Post subject: |
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| Ernie-NH wrote: | Hi Jim... Hi Jeeves...
My faulty spelling,,, sorry !
""just below and it=n from of the Motronic""... should read:
"" just below and in front of the Motronic""
I promise, I'll try to do better with the keyboard and not be so hasty !!
Regards again........// Ernie in NH | if that's the only mistake you make today you are ahead of the curve  _________________ K1100 RS 1993,the fast mystic red one with the burnished gold stuff
K 75 C 1986 black,naked and collector plate
R 75/5 1971 black naked and beautiful and under construction,,but getting closer by the day |
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Jim Site Admin

Joined: 17 May 2003 Posts: 3841 Location: WHERETHEFUNNEVERENDS
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Posted: Tue Jun 07, 2011 1:33 pm Post subject: |
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| Ernie-NH wrote: | Good morning Jim...
Thanks for the input... do you mean the 4-wire "connector plug" that exits the tank ? On mine, its not on the left side, but rather connects to the 'female' end coming out of the harness on the right-side just below and it=n from of the Motronic. The "little hesitation" that I mentioned is like a momentary deceleration and then just as quickly it resumes to the correct speed. Was that the type of problem you experienced as well ? Will "Deoxit" at any rate... good advice !
Best regards and Ride Safe !!.........// Ernie in NH |
Ernie - I was getting anything from hesitation to complete cut off. Since I cleaned that connector, I haven't had any problems in over 2,500 miles. _________________ Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000
"We shall not all die, but we shall all be changed." |
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Ernie-NH Flying Brick Rider
Joined: 14 Oct 2009 Posts: 982 Location: Bristol, New Hampshire
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Posted: Tue Jun 07, 2011 2:23 pm Post subject: |
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Hi Jim...
OK !! I've scrubbed the "pins" and "sleeves" and de-oxed all 4 connections, replaced the connector/socket set back together, and now will ride it somewhere ( I-93 ) where I know there are transitions, just to test it out. Will let you ( and Jeeves ) know the results...
Thanks again.......// Ernie in NH _________________ AMA,, American Deaf Bikers
Airhead Beemers Club
'11 G650gs
'95 K1100LT
'76 R100/7 |
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Freedom45 Big Brick Rider
Joined: 19 May 2010 Posts: 71 Location: Phoenix, AZ
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Posted: Tue Jun 07, 2011 2:59 pm Post subject: |
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It is not a switch on K11, it provides a precise angular position to the motronic.
Here is how to set it up: http://www.largiader.com/articles/motronic.html
For full sync: [url=http://k11og.org/forum/viewtopic.php?p=75662#75662]throttle body sync[/url][/quote]
That was the information I needed and it is relatively easy to perform. That is once I figured out pins and positions. The switch is now in the proper position. Thanks again. _________________ 1996 K1100RS SE, K1100K, K75S, Laverda 1200
MOA 9900
IBA #70 NRA |
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