YICS Elimination Device. Interesting. Looks Uncomplicated.

There is an Aluminum Device being offered on Ebay which claims to be a combination YICS Tool -- and -- YICS Elimination Device.

Here it it:
http://cgi.ebay.com/ebaymotors/YICS-Eli ... 942wt_1167

I don't have any Data at all on what to expect if the YICS Passage were to be disabled.
Obviously, there are more Bikes running-around without a YICS Passage than those that do.

Comments appearing in other Forums show the owner raving about performance gains.

Who's going to be the XJ-Bikes Test Pilot and get one of these and see if the thing lives-up to the hype or its a waste of 25-Bucks?

 

Go for it.

 

Re: YICS Elimination Device. Interesting. Looks Uncomplica

He's a regular over on the XS11 Forum

Might still be a couple bucks cheaper here: YICS Eliminator

 

i've been wanting to try a carb tune with a YICS tool for over a year now, but leave it installed?????????? a very interesting idea.

i'm going to give it try.

i'll make my own of course....not only has xjbikes helped me become
a good bike mechanic, but a good fabricator of parts as well. and with
two home depots, a lowes,ace, mom and pops all within 15 min i
should have no prob finding the needed hardware.

i'll post results when done.

 

This device must get lubed-up and Press-fitted.

The Machine Screw lets you capture it and apply pulling force to remove it.

Do you think the whole thing needs to be machined ... or, do you think he made a short-cut YICS Stuffer and found Aluminum Stock of the right O.D.?

 

The rubber seals get sheared off almost every time you try to remove it. It's really designed to be permanently installed as a YICS block-off tool, which means you would need to change the jetting slightly.

 

I got one of them. Used it onece to sync the carbs and what Chacal said did happen. The rubber seals sheared off Going In. So I don't think I got an accurate sync. I didn't try leaving it in. I did get several replacment o-ring with the tool, but with shearing off going in is it realy doing anything?

 

i believe the yics port is 10mm, so he may be using 3/8 rod
the Viton o-rings are good for around 400F
since theres no expansion involved the o-rings would scrape the inside of the yics hole, if the stuff in there was loose it might push it into the smaller hole that connects to each port and plug it up
if there was hard baked on crap in there it might tear up the o-ring going in
a expandable type would be the ticket

 

Re: YICS Elimination Device. Interesting. Looks Uncomplica

HERESY. 8O

 

Re: YICS Elimination Device. Interesting. Looks Uncomplica

While the performance may improve, you would lose gas mileage.
From these boards I know the 650 Seca's get poor mileage compared to there YICS counter parts.

 

To paraphrase Polock..."if there was hard baked on crap in there....it might...plug it up...the smaller hole that connects each port...". In many XJ's that is a very small hole. I'd say that by its nature of being a 25ish year old internal combustion engine,that it's at least compromised in its intended function. The shearing of seals has also happened with me using the expanding type tool and the port was cleaned well first.

 

all very interesting points.

obviously this whole idea requires some more reserch and consideration before just throwing some tubes and hight temp. rubber into the gallery.

any other points out there?

 

Why defeat the system that the engineers designed to work in a specific way?

 

What I would like is a member with both an XJ650 YICS bike and an XJ650 Seca (non-YICS) to chime in and tell us if there really is a noticeable difference or not.

 

I blocked the ports on my XJ1100, it sure makes it easier to tune. When using the YICS tool it was always difficult to get the tool to totaly seal off the passages.
I had to remove the head last winter , thats when I decided to block the YICS passages. I drilled and tapped the holes for a pipe plug. I like it better without the YICS.

 

Nice idea, Fitz, but too many imponderables.
BTW did you get my latest PM?

 

Re: YICS Elimination Device. Interesting. Looks Uncomplica

I made my own using silicone tubing for seals, it is the threaded rod type.

using it on my xj750 gives me a better/smoother idle and fast smooth rev ups. I believe it helps with syncronizing.

That's my 2cents worth.

 

to answer roberts question.
because engineers are frequently wrong.
i've worked in so many industries where the
engineering of a product "looked great on paper"
and failed in the field.

i hope i did'nt hurt any feelings out there .......buts its true

 

Which maybe why it wasn't on the latter bikes, although the 600 I am just stripping has the casting in the head for it but hasn't been machined

 

+1 on engineers being human.
Received a drawing and parts. Built, it started it, but NO OFF button.
The engineer and I got a good laugh out of that one.

My Vmax has a similar sys to YICS, called VBoost, it links all carbs at 6K.
noticeable bump in HP

ab

 

Made one from a hardwood dowell. Just had to sand it a bit and oil it down good to get a firm push-it-in fit.

It did smooth the idle, acceleration has always been good anyway. It may not help an experienced tuner but I found it helpful.

I didn't leave it in for fear that as it got really warmed up my exhaust might start smelling like a back yard barbeque.

 

+1 on the "being human".

i did not mean to insult anyone.

we are ALL frequently wrong at some time or other.

thats prob why we keep screwing around with the YICS system lol.

 

I made a mistake once. I thought I was wrong, but it turned out I wasn't.

 

I hear you parts. We have engineering reviews on our designs and little mistakes occasionally pop up after production. The price of being human I'm afraid.

 

Re: YICS Elimination Device. Interesting. Looks Uncomplica

We engineers are in fact NOT human... we're ANIMALS!!!!

 

Re: YICS Elimination Device. Interesting. Looks Uncomplica

Just ordered the YICS eliminator and will try the tool installed for fuel mileage and performance on a long term basis. I have a stock 1983 xj900 with a k+n filter. Jetting is stock and fuel air screws are 2 turns out with vacuum at 225 on the carb tune. I'm at sea level also. My 900 has 24K miles with 150 PSI compression per hole. I'll keep everyone informed on my experiment with the tool installed long term. Any input will be appreciated. Thanks, Dan / 1983 XJ 900RK

 

I wouldn't put one of those things in my 900.
Certainly not for, ... "Long term".

If you got that Bike running good, ... I'd suggest you simply Pull the Tank ... Pop the Tops off the Carbs and Scrub the Diaphragm Piston Bores with some ScotchBrite Pad (Gray) to remove all traces of aging and Aluma-Oxidation and Polish those Bores to the finest finish you can apply.

Make a "Tweak Tool" out of a Craftsman Pocket Screwdriver so you can adjust the Pilot Mixtures ... On-the-Road ... and do an afternoon's worth of High-Speed Plug Chops to bring all four Holes to a ... "Brown Paper Bag" burn ... and run it the way it was made to go.

 

I certainly wouldn't do it to a Seca 550 either. I think the YICS has a lot to do with the BANG-ZOOM in the powerband above 6K, and the ability to KEEP PULLING right THROUGH redline if you'd let it.

I think YICS solved a problem one way, and was discontinued because a more efficient (or cost effective) solution eventually evolved and was applied to later models of basically the same motor. (Not sure WHAT it was tho...)

(The problem being a clean burning fuel efficient motor that didn't sacrifice performance as a result.)

I like my YICS and I ain't plugging it up.

 

Re: YICS Elimination Device. Interesting. Looks Uncomplica

Thanks for the heads up Rick and will do the slide polish as advised. When I recieve the tool I'll dial in the carbs again and burn at least a tank of fuel for comparison to normal performance and fuel ratings. I also want to order a colortune plug to pair the carbtune. Thanks and will keep an update. Dan / XJ900RK

 

The improvement to the YICS System is called:

"Fuel Injection"

. . . . . . .

On my 900 ... I ColorTune to where I just lose the Blue on the Rich side ... and call that my Pre-set.

Then, I take the Bike and a new set of Plugs to a Proving Grounds and really lean on it to get the Colorization to each Sparkler tweaked to the Brown Bag or Dark Beige.

 

The more efficient (or cost effective) solution was to plug YICS like they did on the 600 :lol: