BMW K bikes (Bricks)

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1Back to top Go down   TPS scrws Empty TPS scrws on Fri Apr 26, 2013 4:27 am

Comberjohn

Comberjohn
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On a recent thread there was discussion about the pros and cons of the TPS.
I've tried the last couple of runs with it disconnected and find it much pleasanter and smoother, especially at lower speeds. Easier on my 6 rivet transmission,too.
It may be imagination but believe that when giving it a bit of stick for overtaking, its feels a bit flat.
I want to do Charlie's suggestion and tweak the TPS's setting to get the best of both worlds.
My problem is loosening the screws.
How do you get at them, particularly the inside one. Does the battery need to come out?
They've been there for 30 years and need careful persuasion.
Suggestions please.


__________________________________________________
Life is not a rehearsal.
2010 VFR 1200F DCT 
2010 R1200GS(gone)
1986 K100 Silver(gone)
2012 K1600GT(gone)
1984 K100RT Madison Silver(gone)
1989 K100LT Stratus Grey(gone)
1984 K100 Red(gone)
http://www.johnsdrivingschool.co
    

2Back to top Go down   TPS scrws Empty Here's the coolest on Fri Apr 26, 2013 5:01 am

ibjman

ibjman
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Here's the cool tool for that job & lot's of others.......and CHEAP too.
I've had one of these in my professional tool box for 30 years. Couldn't possibly live without it.
http://www.sears.com/craftsman-offset-ratchet-screwdriver-set/p-00904116000P

    

3Back to top Go down   TPS scrws Empty Re: TPS scrws on Fri Apr 26, 2013 5:28 am

MikeP

MikeP
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@Comberjohn wrote:
My problem is loosening the screws.
How do you get at them, particularly the inside one. Does the battery need to come out?
They've been there for 30 years and need careful persuasion.
Suggestions please.

A right-angled driver is okay as long as the screw is free. If it's not been disturbed for a long time you need to be able to put enough pressure on it to stop the driver destroying the head and that's not easy with an angled screwdriver.

The last TPS that I set hadn't been moved for years. I removed the coil cover and that gave me enough room to get a stubby Philips screwdriver on to it. I used one of a set that has an 8mm hex section near the handle (failing that, needle nose mole-grips will help). With an 8mm ring-spanner on that I could put pressure on the screw with one hand while turning it with the spanner.

Once it was free, I removed both screws, cleaned them then refitted them and the coil cover as from that point a right-angled driver worked fine.

    

4Back to top Go down   TPS scrws Empty Re: TPS scrws on Fri Apr 26, 2013 6:53 am

twincarb

twincarb
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With regard to setting the TPS, when rotating the throttle to full throttle how far before full throttle should the TPS activate the enrich signal?

On my K it appears to be 1cm of rotation when looking at the grip is this adjustable at all and at what point does it occur on other machines?


__________________________________________________
BMW K100LT 1988 Matt Black Peugeot Electra Blue (ELX) Colour is now confirmed...
Yamaha Thundercat
Triumph Spitfire (not a bike but hell it's British chaps)
TPS scrws 169042 TPS scrws 169034
    

5Back to top Go down   TPS scrws Empty Re: TPS scrws on Fri Apr 26, 2013 9:08 am

Comberjohn

Comberjohn
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Wow ibj! That's expensive. I can buy something similar for £1($1.20) on the high street. Poundland . Isn't Chinese manufacturing wonderful.
Thanks for that tip but have tried something similar using a small ratchet handle that can hold a screwdriver tip. As Mike says, it just twists out as its been there so long.
I tried taking the coil cover off but think I need the stubby screwdriver and/or the needle nose vice grips.
We never need too much of an excuse to buy more tools, do we?

Regards how far the throttle turns, I'm not sure. I would imagine it would only be towards the end of the turn. Probably only enrichens it slightly.
Seem to remember from carb days that you need a slightly richer mixture for acceleration.
It may be imagination but I felt that it was flattening out slightly near peak revs when looking for that bit of acceleration for overtaking.
Really like the smoothness without the TPS so it has to be done.
By tweaking the TPS it means that the switch will enrichen slightly earlier on the throttle turn but don't see that as being too much of an issue. Might make it go even better!


__________________________________________________
Life is not a rehearsal.
2010 VFR 1200F DCT 
2010 R1200GS(gone)
1986 K100 Silver(gone)
2012 K1600GT(gone)
1984 K100RT Madison Silver(gone)
1989 K100LT Stratus Grey(gone)
1984 K100 Red(gone)
http://www.johnsdrivingschool.co
    

6Back to top Go down   TPS scrws Empty Re: TPS scrws on Fri Apr 26, 2013 9:46 am

MikeP

MikeP
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@twincarb wrote:With regard to setting the TPS, when rotating the throttle to full throttle how far before full throttle should the TPS activate the enrich signal?

On my K it appears to be 1cm of rotation when looking at the grip is this adjustable at all and at what point does it occur on other machines?

On the Jetronic ECU bikes, the TPS should measure zero ohms when closed and infinite resistance when open.

If you have a multi-meter, remove the connector to the TPS, attach the meter to the first and second connector of the TPS itself (counting from the outside in),

TPS scrws BMW%20K75S%20%28401%29-M

then rotate the TPS until it reads .00 ohms with the throttle closed. Open the throttle and the meter should register plenty of resistance.

TPS scrws BMW%20K75S%20%28403%29-L

This is for the 2-valve bikes, with the 4-valve models a different process applies (different contacts and a voltage measurement).

    

7Back to top Go down   TPS scrws Empty Re: TPS scrws on Fri Apr 26, 2013 10:23 am

twincarb

twincarb
Life time member
Life time member
Got that Mike, I am more curious as to at what point the TPS says to enrich the signal at standard setup so it can be checked when the adjustment to "tune out" the idle switch side.


__________________________________________________
BMW K100LT 1988 Matt Black Peugeot Electra Blue (ELX) Colour is now confirmed...
Yamaha Thundercat
Triumph Spitfire (not a bike but hell it's British chaps)
TPS scrws 169042 TPS scrws 169034
    

8Back to top Go down   TPS scrws Empty talking about on Fri Apr 26, 2013 12:03 pm

ibjman

ibjman
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You are only talking about a very TINY change between active & inactive in the throttle closed position. We want the switch to almost connect (or disconnect, whichever is correct) at the idle stop position. The miniscule change at wide open throttle would be nil, like the difference between contact at 99.8% and 99.82%.
Will not change the WOT setting in any perceptible way.

    

9Back to top Go down   TPS scrws Empty Re: TPS scrws on Fri Apr 26, 2013 10:18 pm

RicK G

RicK G
VIP
VIP
I checked out where the switch actually operates and the switch closed after the butterflys went past the point where they were no longer effective because the shaft is wider than the butterflys. So from that I would day that you will get no difference at all in the WOT situation.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

10Back to top Go down   TPS scrws Empty Re: TPS scrws on Sat Apr 27, 2013 6:47 pm

Comberjohn

Comberjohn
Life time member
Life time member
Surely the point is that the mixture is enrichened by the ECU at full throttle when the TB are fully opened.
My experience today with and without the TPS, seems to show that there is a slight boost to full throttle settings with it connected.
But there again, imagination is a wonderful thing.Smile


__________________________________________________
Life is not a rehearsal.
2010 VFR 1200F DCT 
2010 R1200GS(gone)
1986 K100 Silver(gone)
2012 K1600GT(gone)
1984 K100RT Madison Silver(gone)
1989 K100LT Stratus Grey(gone)
1984 K100 Red(gone)
http://www.johnsdrivingschool.co
    

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