04-29-2020, 04:58 AM
Who else thinks it's an alignment problem, thanks Pavel.
Imagine looking at the iacv from the back;
During the time when the rev's are low, can you blip the throttle and move the iacv 1 "nose up", " nose down" left or right?
If it rights itself during one of these movements that would indicate a misalignment with the cylinder, there are two "o rings" holding the iacv in place, they may have enough flexibility to move just enough to clear the dragging spot.
Next thing is to maintain the new position of the iacv somehow.
Interesting observation Pavel.
Not our bike but here is what the iacv cylinder looks like, notice the pin inside the cylinder which runs in the groove of the piston which prevents the piston to rotate;
What if the bracket on the back of the iacv is slightly off measurement or positioned a bit in one direction?
It seems the piston gets "stuck" when it is extended furthest into the cylinder and restricts the idle air flow the most.
Speed the wiring does not change polarity in a reverse rotation but the micro controller decides to reverse the 90 degree timing step and flips 180 degrees, exactly like when you walk backwards and change the timing of your feet, one behind the other instead of in front, same thing
Imagine looking at the iacv from the back;
During the time when the rev's are low, can you blip the throttle and move the iacv 1 "nose up", " nose down" left or right?
If it rights itself during one of these movements that would indicate a misalignment with the cylinder, there are two "o rings" holding the iacv in place, they may have enough flexibility to move just enough to clear the dragging spot.
Next thing is to maintain the new position of the iacv somehow.
Interesting observation Pavel.
Not our bike but here is what the iacv cylinder looks like, notice the pin inside the cylinder which runs in the groove of the piston which prevents the piston to rotate;
What if the bracket on the back of the iacv is slightly off measurement or positioned a bit in one direction?
It seems the piston gets "stuck" when it is extended furthest into the cylinder and restricts the idle air flow the most.
Speed the wiring does not change polarity in a reverse rotation but the micro controller decides to reverse the 90 degree timing step and flips 180 degrees, exactly like when you walk backwards and change the timing of your feet, one behind the other instead of in front, same thing