carb synch adjustment

[Guest]

There are many posts on carb synching and adjusting the idle screws of #1,2 and 4 carbs but I can't find an answer to my "dumb" question.
I just want to verify that when backing off the 5/16" locknut you would turn the flat head idle adjuster screw downward(clockwise) to increase the vacuum, correct? In other words this would open up the carb to allow more air to increase the vacuum pressure?
How many turns might it take to notice a 2cm increase or would you notice an increase with just a half turn (180 degree) of the flat head screw?
thanks

[Steve]

Even though I JUST did a carb sync on TheCafeKid's bike today, I can't remember which way you turn the screw to adjust the vacuum higher or lower.

Every time I do it, I have to refresh my memory for that session, but I end up moving the screw both ways, anyway.

How many turns? Less than 1/4 sometimes. You will fight yourself getting the gauges lined up, then find that they mess themselves up when you tighten the locknut. I tend to snug the locknut, check the reading, then loosen the locknut, overcompensate with the screw, then snug the locknut again, hoping it's right this time.

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[catbed]

in opens the valve, out closes it.

[lurch12_2000]

in opens the valve, out closes it.

I assume when you say "in" that means clockwise and "opens" increases vacuum pressure?

[Steve]

See? That's why I don't even try to remember. :shock:

I just watch the gauge. If it goes the wrong way, I turn the screw the other way. 8-[

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[lurch12_2000]

See? That's why I don't even try to remember. :shock:

I just watch the gauge. If it goes the wrong way, I turn the screw the other way. 8-[

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I tried turning it to test the other day but 1 full turn clockwise didn't seem to change anything!

[catbed]

when i say turn it in i mean clockwise and when i say open i mean decrease vacuum.

[Roostabunny]

How many turns? Less than 1/4 sometimes. You will fight yourself getting the gauges lined up, then find that they mess themselves up when you tighten the locknut. I tend to snug the locknut, check the reading, then loosen the locknut, overcompensate with the screw, then snug the locknut again, hoping it's right this time.

Fighting yourself is the perfect phrase! I've gotten to love that "locknut limbo" in a sick way.

Gotta use the Force. Let go of your conscious self... reach out with your feelings. Like Luke Skywalker, closing his eyes, pulling the trigger, and blowing up the Death Star - syncing is my most Jedi moment. :-D

[TheCafeKid]

After watching Steve today, as ive never seen BS cv type carbs done, I can honestly say I would have been cussing and throwing wrenches! LOL The VM carbs seem to be MUCH easier to dial in, and from the looks of things, one effects the others MUCH less.

[chef1366]

I tried turning it to test the other day but 1 full turn clockwise didn't seem to change anything!

That's no good. Maybe an air leak or tight valve clearance.