1.5 turns out. go from there. synching them is making sure they are pulling up the same on both sides. if you have cv carbs. there really isnt anything else to do. the only thing you should have to do is maybe jet up. but if you didnt change filters, most carbs dont need it. if it does, itll fall on its face at wot. pulling on the choke at wot should clean it up a little. if it does, jet up.
synching other carbs means checking if the vacuum is the same using a manometer. you use a gauge that goes between the carb and the intake valve. usually a bung on the carb is removed, then the hoses attached. the guage will read the vacuum and let you know which carbs are pulling more and which are pulling less. adjusting he cables or linkage is how you change those numbers. with cv carbs, the vacuum slide does this automatically. the reason there is no adjustable needle on a cv carb. so the only thing you can do is make sure the butterflies are opening simultaniously, by adjusting the cables and idle speed screw. the butterfly opens and allows more vacuum on the idle circuit bringing in fuel. as the slide detects more vacuum, it lifts bring in more gas through the needle jet. so if youre running stock carbs, make sure the idle adjusts are the same, the cables pull the same, and the air screw is out 1.5 turns to start. keep in mind, a carb that is clean and actually working, will be affected alot by any changes made. a dirty shitty running carb will be affected alot less by things like jetting changes etc. basically, you can jet and airfilter til you puke, and make little or no difference on a screwed up carb.
jc
Edited by - joe c on Oct 08 2007 9:13:03 PM