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CB1100 Idle speed instability problem
The housing of the valve is quite deep inside and difficult to check. I tried to check the clearance but I couldn't have a very good feedback so I couldn't say. I have started the engine, did the warm up, severeal times from 1st gear to neutral and the idle speed is very stable. Before the replacement it was quite easy to make it fail. First test looks ok, but still have to do some test ride to confirm the issue has dissapeared. The thing is that I couldn't do any check or diagnostic procedure that could point to a failure of any component. It could point to a mechanic failure of the IACV as some members have been stating.

PD: I have made 8 kilometers with start stop driving and everrything OK. By the way, I can not access the spreadsheet, why? I requested access but no answer yet.
(05-08-2020, 07:51 PM)syncronizator_imp Wrote:
(05-08-2020, 07:08 PM)max_imp Wrote: That is quite an accomplishment speed, thanks a lot for the pictures.
I have always wondered what the iacv looked like inside, you can see the poles inside and the offset of the two coils to produce the different step positions, these steps are very small indeed, can you measure if the rotor has more than two poles with another magnet?

It will be interesting to see the outcome of Pawel's tesrting, you guys have contributed a lot of information!

So it does not look like something is out of alignment by the absence of any scratches, we have never seen any.

What i did notice is that the mounting plate with the two screws only fits correctly one way, when it captures and locks the notch in place and that was correctly mounted in your very first picture labelled "progress so far" so no factory mistake there.

Oh and please don't throw any bits away, we may need to look at them a little closer after the thinking has focused some, how's the moustache? took me a while to figure that one outBig Grin

Hi MAX,
Hi Speed,
Hi all,

My video is here:
https://youtu.be/Qys_LsYXhWQ

Speed was it a play between spule and chamber ?
Was is a lot of space or was it tight?

Hi MAX,
Hi Speed,
Hi all,

My video is here:
https://youtu.be/Qys_LsYXhWQ

Speed was it a play between spule and chamber ?
Was is a lot of space or was it tight?
That video is clue. It makes sense that after giving throttle my idle speed is very low (valve closes) and little by little it goes to normal (opens step by step) if it does not stall before. Unfortunately still I don't know what is the problem, if this is the normal behaviour of the IACV engine speed should lower after giving throttle... Now I am really lost... I don't understand anything.
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Messages In This Thread
RE: CB1100 Idle speed instability problem - by Speed_imp - 05-08-2020, 09:43 PM

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