[QUOTE=twinsig;841716]So, to be clear, even restricting the vac guages won't reduce needle movement to acceptable levels?
I used to have a tech day at our house every spring. Lots of folks wanted to synchronize carbs or throttle bodies. I used to play a game. I would synch things by ear first, and then attach either my mercury sticks or Twinmax and see how close I got. I occasionally had to readjust the synch at idle but seldom readjusted the synch on the cables.
I am fairly confident I can synch by ear a lot better than I could trying to use two vacuum guages. There are just too many better devices for balance: Carb Stix, Twinmax, Carbtune, Harmonizer, etc.
If I had a use for a vacuum guage for other uses, I'd just get one. They are fairly cheap.
I have done the vacuum gauge thing. It does not work well for me. I used "snubbers" to keep the needles from wiggling so fast I could not see them. Then what I was reading was the average vacuum compared to zero or the atmosphere.
When I had everything matched to watch the 4 gauges all read together was satisfying. This is different, only two cylinders.
With any of the other gauges you are only comparing one side to the other. Much easier. I think more accurate.
I just use a 6' stick and 20' of clear line with ATF in the U. It works on all my 2 cylinder bikes.
Lot's of high-tech stuff here.
I'm still using my home made manometer with ATF in it.
Seems to work quite well.
Maybe I'm just cheap.
No. Frugal. That's what it is; frugality. Sounds much better and is more easily defended.
Convincing arguments, thanks everyone for the schooling...:type:type
Ordered on Sunday evening, received today - Wednesday.