Why you should vacuum sync.

[GLoweVA]

How did I ever survive with out a vacuum sync rig ?!?! (I've owned this bike for over 7yrs now and have had the carbs out many time for cleaning)
So, I had only bench sync'd (wire tie method) until now.

I built one very similar to the one in the tool tech post.
Got the gage from harbor frieght and the PVC/fittings/tubing from Home Depot and the valve from the pet store. (around $20 total)

I can't believe how easy it was to use it.
The hardest part was hooking the tank up backwards (turned around) (damn fuel lines and tank angle)(had to put something under it so it would sit level)
Just a few tweaks on the carbs and bamm!
The readings weren't off that much and I didn't think that it would matter.
Boy was I wrong!
Purrs like a kitten, throttle response is great and idles just right.

I read time and time again in this forum about the vac sync and I thought, naw, my bike runs just fine, I don't need to spend any more money. I wish I had done this years ago. The amount of money I could have saved in just fuel alone would have paid for itself many times over.

Thanks again to all of you for your insightful input to everyone's issues.
I guess I can safely say: been there, DONE that!

['OlGuiltyBoy]

I'm gonna have to try that out. A buddy of mine were just talking the other day about going half on a gauge ... but if we can buy/make on, thats even better!

[jkoeringMN]

I haven't used a gauge set up to do that to mine. I ended up using some clear tubing and transmission fluid. Hook up both ends to the vacuum tubes and adjust from there until the level is even in both tubes. Gauge is undoubtedly more accurate but even after this tubing set up, noticed a huge difference.

[DAVINCI]

This sinking thing is getting a lot of airplay. how deep do you have to sink them and how long do you leave them under?

[GLoweVA]

This sinking thing is getting a lot of airplay. how deep do you have to sink them and how long do you leave them under?

HAHA

As a retired Navy Submariner, I'm used to going down and staying under for a long time. The tricky part is knowing when to come up for air.

I thought about the Tranny fluid setup, but I was scared of the possiblity of sucking that stuff in.

[cywelchjr]

HAHA

As a retired Navy Submariner, I'm used to going down and staying under for a long time. The tricky part is knowing when to come up for air.

I thought about the Tranny fluid setup, but I was scared of the possiblity of sucking that stuff in.

That's one of the reasons for using tranny fluid, if it sucks in, it just burns it. Even with that setup, you should put some sort of restriction in the line to dampen things, but they are actually more accurate than gauges, just harder to setup and touchier to adjust, and I'm not sure 99.9% of people could tell the difference between a sync with a properly adjusted cheap gauge set and a top quality set or the tube and tranny fluid setup (which done right is the most accurate of all).

[b.walker5]

Gauge is undoubtedly more accurate but even after this tubing set up, noticed a huge difference.

Accuracy has nothing to do with it. Consistancy is the key. Doesnt matter what the level is, or where the guage sits as long as all 4 read the same.

[Cobia]

I agree with Brian, as long as they're all the same...
Look on CL, I found a set of brand new 4 accross vacuum guages that a crotch rocket owner didn't know how to use for $25, normally $75+

[DGXSER]

If you use a 4 gage set up, it IS important to "calibrate" the gages. Meaning, hook each one up, one at a time, to the same cylinder or a mity-vac or similar and verify they get the same reading. If not , mark the adjustment on each gage. They will most likely be off some.