sync the carbs
01-16-2013 | 12:06 PM
#1
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SuperSport
Joined: Jul 2012
Posts: 582
From: Santa Fe, New Mexico
sync the carbs
I'm bbaaaacckk! With another question that is just burning a hole in my skull. Has anyone ever checked to see if the linkage between the two carburetors is set so both carburetors are "leaving" at the same time? On other machines I've had it was part of the tune to set both after getting idle sync set. Slowly run the rpm's up to 3000 to see if both are synced at higher rpm's. Just curious. Will check it out myself and come back. Thoughts or admonishes?
01-16-2013 | 12:13 PM
#2
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MotoGP
Joined: Aug 2007
Posts: 5,942
From: Lake View Terrace, CA
I'm bbaaaacckk! With another question that is just burning a hole in my skull. Has anyone ever checked to see if the linkage between the two carburetors is set so both carburetors are "leaving" at the same time? On other machines I've had it was part of the tune to set both after getting idle sync set. Slowly run the rpm's up to 3000 to see if both are synced at higher rpm's. Just curious. Will check it out myself and come back. Thoughts or admonishes?
With the aftermarket billet stacks it works fine.
01-16-2013 | 12:36 PM
#3
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SuperSport
Joined: Jul 2012
Posts: 582
From: Santa Fe, New Mexico
so, are you talking about aftermarket velocity stacks that are the same dimensions or is it something to do with the bell shape or the measurement of the outside bell from the carb intake, distance from outside of bell mouth to where it connects to intake? Am I making sense?
01-16-2013 | 04:58 PM
#6
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SuperSport
Joined: Jul 2012
Posts: 582
From: Santa Fe, New Mexico
I believe Hawk is talking about these.....
Attachment 15027
Attachment 15027
On antoher note, I did try to sync the carbs at 3000 rpm and found it frustrating. After re-syncing the carbs that annoying hitch that's been ******* me has gone, no more hiccups at 3500 to 4000rpm. Took the vtr out after sync trying to make it hitch and couldn't get it to do it anymore. This engine is very particular about synced carbs it seems. One thing that surprised me is that right after I set the carbs the bike stalled at lights several times. Like it does when the kick stand is deployed and it's put into gear, but only at idle. That cleared up after the bike got good and hot and didn't come back.
01-16-2013 | 06:24 PM
#8
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Superstock
Joined: Jul 2009
Posts: 285
From: Snohomish, WA.
Interesting, I usually sync at Idle 1200+/-100 rpm. I feel that even with V-stacks that at higher revs, while stationary, the airflow into the carbs is most likely not equal and thus doesn't give me a accurate indication of synchronization. I could be totally wrong on this but from what I have found, even when I slowly increase revs up to about 4G there is not enough differance between the carbs to bother adjusting differently at idle. This could be true just based on my set-up, and may be completely differant for others, depending on many factors such as type of filter, carb set-up and engine state of tune, etc. etc.
01-16-2013 | 06:35 PM
#9
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SuperSport
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From: Santa Fe, New Mexico
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