YICS

he said what I said, just better. haha

 

Hammerheadx / dpawl31, you must be assuming that the YICS ports are pristine, clean, which in most cases ain't the case, most are blocked or semi blocked & all 4 cylinders clogged to different degrees, factor that into your dyno readings.

 

Well how do you get those ports clean then? If Cleanliness is Next to XJ Godliness then Cleaning that port sounds like a great step for us XJers

 

You have to get a long kabab skewer with a right angle bend on the end, then indulge in some amature gynecology.

 

Seriously?

 

YEP

 

I'll go out and give it a try right now! Thanks wiz. Always tryin to get his beaut to run better

 

Or you could purchase the pre-made tools from me that allow you to accomplish such tasks easily............

 

oh len, there you go again, trying to sell us unsuspecting XJers useful tools needed to complete the job correctly. HAHA.

 

Threaded rod, very skinny threaded rod that will fit in the holes works great too.

And you can also soak a clean rag in carb cleaner and drag it through a few times, then let it sit in there for a bit.

Wiz - the dyno readings, the syncing, etc... all under the assumption you are running with a clean bike... including the passage...

Who uses a YICS tool without cleaning the passage anyway O_O
Anything that touches my bike, anywhere - whereever it touches, that gets cleaned before use.

Always clean the hole before you use your tool. O_O

 

Hoppes #9 gun cleaner solvent works great on cleaning the YICS passage.......

 

And afterwards, pack some black powder and a cap way down in there, and give that bolt a tap! haha.

That oughtta clear it! lol

 

Cleaning the bore ain't the prob', it's getting up into the ports & I bet most DIYers don't.

 

So technical... yes, cleaning the bore AND the holes IN the bore.

Still, you can't go all the way in the holes anyway.
Can't really get at those with the motor all together, at least past the first bit that you can get a bent piece in.

 

OK, now I feel totally lost. I know the YICS passages on the 550s are different somehow (you don't need one of Lens's special tools) but how/why do they get clogged up? They're on the intake side; all that ever passes through them is high-velocity fuel-air mixture which I would think would be the equivalent of aerosol carb cleaner. How does enough "dirt(?)" get in there to clog them up? Every time I've had my 550s open and stuck a Q-tip in there it's been clean. Is this a "sitting" thing?

 

The 550 YICS intake ports are HUGE compard tot he 650-up ports, which are tiny........

 

Yeah, mine are barely visibly really. I mean it is hard to tell that far in, but they are probably (from what I remember) smaller than the stick part of a QTIP.

 

they are. even smaller than a tooth pick.

 

- just done a quick explore and the 400 passages can certainly take bigger than a toothpick. YICS passage is clean as a whistle though. As 'fitz said, can't see what could block them.

 

Late to this thread but, thought I would add the YICS bikes do seem to get better milage.
If you look back through the many "What milage do you get" threads, it is pretty clear that YICS bikes are ahead in this aspect.
From what I've seen the 650 Seca's usually come in at 35-40mpg.
Where as the YICS bikes get closer to 45-50mpg.

 

Heck,
My 750 YICS Maxim is getting between 45 and 53 mpg, for the last 5 tankfuls, depending on how i ride it.

Knock on wood...

 

Well said, Hound, but the thread was about was the YICS tool neccessary when syncing the carbs.

 

Heck, hound, pay attention! hah. jk!

Has anyone here (Fitz?) done the test to see what difference there is doing the COLORTUNE with and without the YICS tool, yet?

 

I will be but my homemade YICS tool died and I havn't got my next order from chacal pulled together yet.

chacal's discovery of the reference to the use of the tool for EGA adjusting indicates Yamaha believed it to be necessary; I am quite curious to find out exactly how much difference it makes in THAT PHASE of tuning.