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CB1100 Idle speed instability problem
(04-29-2020, 05:53 AM)max_imp Wrote: Pavel thanks for all this detailed explanation, is it possible for you to connect the old iacv to the connector on the bike and see how easy it is to stop the stepper motor ( "exhibit A" ) from turning?

A video would be even more helpful......

We have never had a dirty chamber reported, the air through it is filtered and mixed with a very small amount of blowby gas from the crankcase ventilation, the "square" intake chamber for the iacv can be seen below the iacv in between the two t.b. intakes.
This same throttle body has been used on several types of Honda bikes and does normally seem to have no problems, it's only some of the 2014 models that are affected and we don't yet know why.


Yes MAX of course I will.
However I would like like to go for a few trips first in the upcoming weekend and finish the test that will answer the question whether replacing the IACV solved the problem.

I do not want to spoil the IACV adaptation made by the HONDA service.
Let's give the current situation a chance to prove whether the IACV exchange helped.

Recently, the problem occurred again after driving 200km.
For the 200km nothing indicated a problem.

I asked the mechanic how big the dirt was in the chamber.
He claimed that it was a rather thin layer that could be wiped easily with a finger.

Personally, I think that if IACV could be shifted back only 2mm so that a slot was created and then turn on the engine and finally let the vacuum suck in some fluid like WD-40 or chain cleaner , then IACV would be washed without disasambling half of the motorcycle.


My other idea is to let WD-40 by putting my hand into the air filter housing .... but I'm not sure if there is a place where the vacuum would suck WD-40 into the IACV chamber ...

Maybe a smal video camera could show where to inject dirt cleaner ?
Another idea is that IACV may be clean but its electrical properties may have changed and is worn and finally not changing its position as it should.
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RE: CB1100 Idle speed instability problem - by syncronizator_imp - 04-29-2020, 06:59 AM

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