carbs going out of sync!?

[88kat-rider]

Quick question....

I did a sync with my motion pro. Sync went nice and easy....all balanced out

I took it for a good drive afterwards and noticed after a half hour of riding my idle kept changing....I would constantly have to re adjust it.

then it started to afterfire through the exhaust on decel alot...(running lean)

I got it home and checked the synch and it came way out. I re did the sync and went on another ride and the same thing happend...are the vibrations of the bike running causing an adjuster to slowly spin or what else could be the problem??
is it possible the A/F screws are able to move on their own?

I have not checked the sync again yet...just wanted to see if anyone had any ideas of what i could look for..

I know the center adjuster on the rail for the sync has a lock nut to keep the two pairs synced together and i had tightened it each time...

I should mention that it is an 88 600.

[Badfaerie]

I'd say it's more likely that you have a crack or something causing an air leak when the motor is warm. I've seen this happen with the o-rings that are between the intake boots and the motor a couple of times.

[arsenic]

is it possible the A/F screws are able to move on their own?

That has nothing to do with your carbs going out of sync.

[88kat-rider]

That has nothing to do with your carbs going out of sync.

no your right, but it would cause my idle to change...(if the A/F screws slowly turned on their own)but it would also cause my idle to change if the sync went out.

I rechecked the sync, this time it was fine, didn't move like the first time.

Now that the bike is running and i can drive it around, my friends who also have bikes say mine sounds funny?!?! like its running on 3 cyl or something but all 4 header pipes are scalding hot with the bike running so its going on all 4. I will admit it still sounds off, but thinking its just how the bike sounds with the vance and hines 4-1 system

[05RedKat600]

Take video. Post here.

[cintidude04]

Are you trying to sync the engine when it's cold? Make sure you get it up to operating temp before you bother syncing.

[MikeyZ]

Also, after each adjustment blip the throttle a tiny bit so the screws can set...

Dont suck up the fluid tho! I have the Morgan Carbtune, so I dont have to worry about that.

[girlykat]

intake o-rings

intake boots not seated on the carbs fully?