YICS

Before you jump down my throat, think this through.
The YICS engine runs without having a YICS tool inserted, so why use the tool when syncing the carbs, surely you would want to sync the carbs with the head in it's normal configuration.
I am not alone in thinking this.
Comments? (I'm sure)

 

Troublemaker.............

 

I can see both sides of the coin for synch'ing but for coloutuning?

 

It's probably possible to synch without the YICS tool, but it would probably also take a lot more time. Reason is that, without the blanking tool in, adjusting one carburetor would affect the vacuum draw of its cylinder, but also of the other cylinders to a lesser extent, so there'd be a lot more back and forth to get everything balanced.

 

i have a non yics 650 maxim and a yics 750 seca i use a 4tube mercury sync stick and i do not use a yics tool both bikes run great

if you can use the stick style gauges instead of the dial style your life will go much easier

 

Maybe, but the end result would be a better reflection of the engine's overall performance.

 

It DOES take a lot more time and back-n-forth. The reason for the tool is to isolate each cylinder from the others only for the purpose of adjusting. Without the tool, your reading on any given cylinder is actually a reading of that cylinder PLUS the rest of the YICS system. It's easier to adjust if you're just looking at that cylinder without any outside (and possibly still mis-adjusted) influences.

Once you're all adjusted, there's no harm in doing a reading with the tool out; as you said this is a reflection of the overall performance. And it's kinda fun; but adjustment with the tool is more precise.

 

Back to Basics 101:

What is the meaning of the word "synchronization" as it applies to Yamaha 4-stroke, in-line, 4-cylinder air pumps?

Some-where, over the rainbow,
There's an answer waiting, for you.....

 

All sucking the same, so why adjust them in isolation?

 

Having the WHAT "sucking all the same"?

 

The synchronization adjusts the setting of each carburetor's throttle butterfly valve so that the fuel / air mixture passed by each carburetor results in an equal load placed on each of the cylinders. 8)

 

i tried it with and without, without works better for me. don't take my word for it though, try it yourself

 

Support is building.

 

May be a pyrrhic victory of sorts..............

Well, that's correct in a very round-about, circuitous manner, although the phrase "load placed on" may be a bit mis-leading.


Can we try this instead:

* "Synchronization" means equalizing the power output/contribution of each cylinder so that they are all equal.

* Since many different factors contribute to, interact, and thus result in the determination of any single individual cylinder's power output (for example: piston/ring/cylinder wall interactions of each individual cylinder; intake and exhaust valve face/seat condition, valve clearance/lift/timing of each individual cylinder, carb fuel/air mixture supply----ratio and amount----of each cylinder, etc.), but we have no way of adjusting or compensating for many of those individual component factors (besides valve clearance adjustment), then the only user-manageable procedure available to adjust the power output, by cylinder, is via manipulaton of the throttle shaft/butterfly valve openings on each individual carb, thus slightly increasing or decreasing fuel volume to each cylinder.

* Cylinder power output is measured via the strength of the vacuum signal that a cylinder produces.

* Vaccum signal strength is measured via a vacuum gauge, technical name mamometer, street name synch gauge or "sticks".


All in favor, say "aye"..................

 

O bolliks :?

 

I synched my carbs last week, but this time I didn't use the YICS tool. It seems to make NO difference with or without for me. I don't think the YICS passage makes a big difference while idling anyways. My bike runs like a cat on fire and idles smooth.

 

Whazzamatta Wiz, is it raining in Oz and the Kawi's almost done so you had nothing better to do?

Gentlemen; We have another debate here that is one of science vs. opinion; but bigger than that, once again, looms the true question:

Do you really think you're smart enough to out-engineer Yamaha?

If you believe you are, then go for it.

If like me, you have found through experience that it's very difficult to out-engineer the legion of engineers that designed these things, you'll accept the need to do it their way.

 

A technical term I'm not completely familiar with......... 8O

 

Trial and Error. I guess you should try with and without. Might as well see if it makes a difference at all.
I'm going to try without today, and pick up a tool in a couple weeks and I'll post my findings.
This is all very interesting
-SLKid

 

OK ya, didn't need to out-smart the Yamaha engineers here. Just wanted to make the bike run a bit smoother and not using the YICS tool seemed to work better for me this time.
So go ahead and use the tool if you'f like. I don't give a rats ass one way or another.