Carb sync quick question

[Zombis]

Ok So just cleaned out my BS 34s and got them back together hooked up the homemade manometer. I know that the sync screw changes the position on the right cylinder; now onto my real question. if the right cylinder pulls more vacuum than the left cylinder, I dont want to suck up anymore 2 stroke, does that mean that the sync screw needs to be turned in or out to balance to the left side?

I think last time this happened I ended up taking the carbs off and used a piece of paper as a feeler gauge.

 

[weekendrider]

Turn the screw out to lower the throttle plate?
Damn not sure now and it's to cold to go the shop tonight.

 

[Zombis]

its ok. Turns out right cylinder wasnt firing like at all. Experiencing mad cylinder wash like compression test showed 65 psi added a touch of oil to the cylinder and the compression came back to 150.

I was turning the screw and getting absolutely nowhere.
btw its like 60 degrees here in CA

 

[hotrdd]

Turning the screw counter clockwise should lower the vacuum on the right carb.

 

[littlebill31]

Yes, turning the screw clockwise opens the butterfly, ccw closes it.

 

[grizld1]

Right that turning CW opens the throttle, wrong that opening the throttle increases vacuum. More restriction=more vacuum. Open the right throttle (turn CW) if your right column is high, close the right throttle (turn CCW) if your right column is low.

 

[5twins]

Yes, reading a manometer can be confusing. At idle, the higher column is the slower running cylinder. At speed, say 3 or 4K, the higher column is the faster running cylinder. I can never remember which way to turn the screw either. I just give it a little turn either way and see what it does, lol.

 

[littlebill31]

I will add that my carbs will not run correctly when the manometer is even on the scale. Probably due to having a 30+yr old engine, and other variables, my carbs need to be set differently. If they are even, I can hear a difference and it runs a little "off". So I have to adjust by ear and throttle response.

 

[XSLeo]

When I adjust the sync, I do as 5twins does, turn the screw one way abit and see if it's right or not. If right I keep going, if wrong I turn it the other way.
A little two stroke oil won't hurt anything. Even anti-freeze won't. Any thing that gets in there gets blown right out the exhaust as fast as it gets sucked in.
Leo