Surprise! One more idle question

I have had my midnight maxim for over a year now, and I can't make it idle. It has a K&N filter, the carbs are cleaned and 3 turns out, but I don't have a YICS tool.

Do I need a YICS tool to make it idle? The bike runs good, but if the idle screw is to high changing gears is a pain and it will overrev when stopped. If the idle is to low I have to keep the throttle a little bit turned.

Do I need the stock filter and YICS to make it idle? Anyone has the same issue? (And hopefully solved it?)

Will the YICS tuning make such a difference?

Thank you guys!

XJ750MK 37K Miles

 

I sprayed the boots with starter fluid and the idle didn't go up, no cracks there.

The K&N filter is listed as stock, so the YICS tuning is the issue?
...

 

OK, I'd say you might have a sync problem there.

Bear in mind that there are 2 schools of thought out there:
1) is to sync your engine with the YICS tool thus isolating each cylinder 1 at a time

2) the other school of thought is that the YICS tool is a bunch of crap, and that you can do just as good a job without the tool.

I for one have synced them both ways and do indeed prefer to use the YICS tool.

 

Hey Gene, whip out a YICS and try it yourself! Cheap enough and only an hour or so of your time, a noob could do it. Pics are in my gallery and in our link section under DITY. I firmly believe you will find it does make a difference.

 

OK, maybe I'm dumb, but I don't get it. When you stab the YICS blanking tool into it's home, then what?
You tighten up the wing nut.
How is this not just moving the tool back out of the hole? What locks the opposite end of the tool in place?
I've apparently missed something. Probably extremely obvious to everyone but me.

Does the tool stay in place because the squashed rubber holds it there? Can't be.

 

I think that is how it works

 

Brad the tool has rubber rings that seal off each carb from the other.
The YICS passage is designed to act as an equalizing chamber that equalizes the vacuum and causes more turbulance in the intake flow to cause the fuel to mix more efficiantly.

When you seal off those ports then each carb and cylinder can be evaluated seperatly from the others.

Theres more to it but I'm on nightshifts and dont feel like itnow sorry.

 

No worries. Sleep is fairly important too.

I just wasn't clear on how the tool stays in place.

I guess that when the rubber seals are extruded and seal off the equalizing ports, the pressure of the rubber holds the tool in place. I can't help thinking that if you tighten the wing nut too much, it will pull the tool out of alignment. Maybe you just can't tighten it enough to pull the tool out far enough to have the rubber seals not aligned with the ports.

 

Alignment isn't critical. All that needs to happen is that the tube gets plugged between carbs. Tightening the wing nut expands the rubber sealing.

No need to hold it in there - there's nothing trying to throw it out. The friction from the rubber is enough.