BMW K bikes (Bricks)

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101Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Fri Jun 21, 2019 6:41 am

Poupy


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Can you illustrate the air intake system you made?

Are you sure of your flow meter flap free movements?

    

102Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Sat Jun 22, 2019 6:03 am

DBRMN

DBRMN
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Tuning My K100 - Page 3 Img_3210

Hope that makes sense, and yes the flap moves freely.

@Poupy wrote:Can you illustrate the air intake system you made?

Are you sure of your flow meter flap free movements?


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103Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Sat Jun 22, 2019 8:42 am

Poupy

Poupy
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@DBRMN wrote:So as I suspected air leak was one of the major sources of the problem. I narrowed down the air leak to one of the 3D printed parts I made (which supposedly isn't 100% air tight material but thats not a concern for now.)

You mean the material used for making the 3D parts before and after the air flow meter might not be air tight? 

How is realised the junction between your flow meter (where you placed it) and the new air box above throttles? Absolutely air tight?

On those k2s the air flow meter flap is supposed to very closely follow the throttles position, as it is it which monitors the electronic control. Hence the importance of reliable air thightness of the circuit between flap and throttles.

    

104Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Tue Jun 25, 2019 2:53 pm

DBRMN

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@Poupy wrote:
@DBRMN wrote:So as I suspected air leak was one of the major sources of the problem. I narrowed down the air leak to one of the 3D printed parts I made (which supposedly isn't 100% air tight material but thats not a concern for now.)

You mean the material used for making the 3D parts before and after the air flow meter might not be air tight? 

How is realised the junction between your flow meter (where you placed it) and the new air box above throttles? Absolutely air tight?

On those k2s the air flow meter flap is supposed to very closely follow the throttles position, as it is it which monitors the electronic control. Hence the importance of reliable air thightness of the circuit between flap and throttles.
Supposedly the material used to 3D is constructed in layers which air is able to pass through, however this effect is very marginal and is most likely having little impact. So I'm not worried.

If you have a look at my diagram, one end is silicon sealed and the other end has two o rings with grease. I have faith that they are both air tight.


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105Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Tue Jun 25, 2019 4:05 pm

Poupy

Poupy
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That is why I asked the question: your sketch is not clear as concerns what comes between the flow meter and the throttles.

One rubber cover in poor condition on a depression plug can create a problem. So, a slightly porous material over a surface of a quarter of a square meter, why not?

Assuming of course that the junctions between your own air box and the various elements connected to it are perfectly air tight.

    

106Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Fri Jun 28, 2019 10:13 am

DBRMN

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So large problem, after reassemble the bike won't run.

It turns over, it has spark and the airway is unblocked. However it seems the fuel injectors aren't working, the injectors worked before so I'm assuming they're not getting power.

I checked for continuity and found that there was no resistance across the tabs of one of the plugs that goes to an injector. This my friend informed me means there is somewhere in there circuit thats being shorted. So i've just opened a can of worms... 

I also checked the fuses and they're fine, except the "Side lights" which was burst.

Anyone have any other ideas what it could be?


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107Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Fri Jun 28, 2019 10:41 am

glennpm

glennpm
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This trouble shooting guide may help.

http://www.kforum-tech.com/electrical/EFI/bike-wont-start-EN.htm

Note that the diagram for the "Electronic ignition module female connector" is not correct. It should be per the attached. Bert is in agreement with this change.

http://forum.kforum-tech.com/members-upload/uploads/Corrected_Diagram_for_Female_EI_Module.pdf

    

108Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Mon Jul 08, 2019 2:22 pm

DBRMN

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So I'm now in Italy for a long time so all I can do is sit and try and work out every possible thing it could be.

There was an incident which I pray didn't have an impact but should mention. I was undoing my seat and dropped the screwdriver onto the battery and lets just say it hurt and there were sparks. Now my friend assured me that the current wouldn't have gone through the ECU because it shorted either through me or the frame and thats where the spike in current would be. 

But if the fuel injectors aren't working and they used to, it could be my ECU is broken...

Besides this I also think it could be some dodgy wiring on my part. However all I've touched is the gauge cluster, so can this interfere with the rest of the wiring on the bike? 

Also I had a look at the chart Glennpm what is the thermal resistance in the airflow meter? Do you think these symptoms would occur just from the air flow sensor not being plugged in properly?


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109Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Tue Jul 09, 2019 5:10 pm

glennpm

glennpm
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Hi, 

I feel that you haven’t ruined the computer, agreeing with your friend.

I tested the air vane controller using a heat gun with caution. I measured the temperature with an infrared thermometer. I then measured the resistance at the measured temperature and checked it against the curve in the troubleshooting guide.

Did you run through the guide to this point with no issues found?

Glenn

    

110Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Thu Aug 22, 2019 4:24 pm

DBRMN

DBRMN
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So I'm finally back and got to spend the day on my bike. I hate to say it but its always the simple things. I feel like an idiot but I'm glad it wasn't something more serious. I also hope this information helps someone else even if I didn't end up needing it.

Turns out the fuel tank wasn't plugged in, so of course the fuel pump was doing nothing, and of course as soon as I plugged it in the bike fired up. So good news.

However, there's always a however, as the name of this thread implies the bike now needs tuning. I attempted that today with my newly bought carbtuner. But it seems I'm going to need more adjustment and will have to touch the blue painted adjustment screws. I know I need to be very careful and only tiny adjustments should be needed.

So thats tomorrows adventure.

Tuning My K100 - Page 3 Img_4210


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111Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Thu Aug 22, 2019 7:53 pm

duck

duck
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You should never need to touch the blue painted screws.

If you can't sync the TBs then there's a good change you have an air leak in one or more of the boots between the throttle bodies and the cylinder head.

Also be sure that you're using the flow restrictors in the hoses to the Carbtune.


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

112Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Fri Aug 23, 2019 1:30 pm

DBRMN

DBRMN
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@duck wrote:You should never need to touch the blue painted screws.

If you can't sync the TBs then there's a good change you have an air leak in one or more of the boots between the throttle bodies and the cylinder head.

Also be sure that you're using the flow restrictors in the hoses to the Carbtune.

I had been advised by a K100 builder that because I had such a radical exhaust and modified air intake system the brass screws may not be enough, which they weren't. Yesterday it was idling like a pig sometimes cutting out. However today i did fiddle with the blue painted screws and balanced it all and it now idles perfectly, I used the brass screws for fine tuning. 

When I was trying to track down an air leak I did check everything, I checked by boots. But I also made sure my seals where perfect. One end of the 3D printed part I made now, with greased o-rings, compresses when I tighten its bracket, and the other end is healthily silicon sealed.

I followed the instructions that came with it and did use the flow restrictors engine side as instructed.


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113Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Thu Sep 12, 2019 11:09 am

DBRMN

DBRMN
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@duck wrote:You should never need to touch the blue painted screws.

If you can't sync the TBs then there's a good change you have an air leak in one or more of the boots between the throttle bodies and the cylinder head.

Also be sure that you're using the flow restrictors in the hoses to the Carbtune.
So Duck I think your right, and I can now explain to myself why. When i began tuning one of the cylinders was way off, which could mean it had an air leak of some description. This would mean in order to get them all in sync I would have to give the other 3 cylinders an "artificial air leak" which would mean the idle would be way too high. 

By the way thats more me writing out my chain of thought so I don't feel crazy.

Then I thought if only one cylinder, say, has an air leak, then in must be after the airbox. So I took it all apart and checked the rubber bookings where they meet the engine case.... hardly anything there in terms of liquid gasket.

So it turns out I applied the liquid gasket incorrectly, thus I have now applied it what I think to be correctly and tomorrow I will attempt to start and tune the bike again. (I also double triple checked everything was tight)


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114Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Thu Sep 12, 2019 2:48 pm

Dai

Dai
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Good man for the methodical troubleshooting.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

115Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Fri Sep 13, 2019 1:43 pm

DBRMN

DBRMN
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So thats it my friends, I've run out of steam... I'm throwing in the towel. Running the bike today it sounded and felt like the air leak had gone but at this point I don't really know. The idle was still way too high... at least it sounded nice.

At the moment I have no money and I'm just about to go to university so I'm going to save up and take it to a BMW specialist and ask them to fix it, make it road legal and ready to ride on the road. I know it going to cost me a lot... at least I tried.


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116Back to top Go down   Tuning My K100 - Page 3 Empty Re: Tuning My K100 on Fri Sep 13, 2019 1:48 pm

DBRMN

DBRMN
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Some fun videos for you:
1. The closest I'm going to get to riding it (Background noise is a lawn mower)


2. Some lovely engine sounds


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