• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Synching Carbs

  • Thread starter Thread starter JATO
  • Start date Start date
J

JATO

Guest
I need to synchronize the carbs on my GS1000. I don't have the vacuum test set, so I was wondering if anyone's done it by measuring the EGT (exhaust gas temp) of each cylinder. To do this would you recommend going Lean of Peak temp or Rich of Peak temp? I have tuned air-cooled aircraft engines in s symilar manner, and I was thinking that Rich of Peak would help with cooling while idling as it does with aircraft. I think this is doable, but if it would be better to just get a vacuum set and do it that way, what figures do I set the carbs to? Thanks for the input.
 
I believe that there is a manometer available that will do this. Morgan Carbtune, I think. Hopefully someone else can give you an answer. Otherwise it's mercury sticks, that attach to the intake boots.

Brad bt
 
Get a set of sticks they are cheap and they will do a better job than guessing. You can be more accurate in your adjustments with vacume than egt.:-D
 
you could make your own sync with a long tube and then loop it arround a ruler "hot dog" style and fill the tube with water, then hook one end of each to your intake boots and keep the ruler horizontal. Then adjust the sync screws until you get the water to level out.... I think it will work :-D
Nick





http://www.powerchutes.com/manometer.asp


martycarbsync.jpg
 
[FONT=Verdana, Arial, Helvetica] I have to add, I have the proper equipment to accurately measure the temp of each header pipe, the measurements won't be guess work.[/FONT]
 
Judging from the lack of response I would guess either no one knows or you need to use a manometer. But I am no expert :)
 
Synching the carbs is going to get all the carb's set to the same air flow. To change a setting your going to adjust the throttle butterfly or slide to increase or decrease ait flow to an individual cylinder. Changing the mixture settings won't get you there, you're balancing air flow.

Using exhaust temp sounds like an interesting means to get you to a properly tuned engine. I've never heard of it being used in bike tuning, so I can't say how effective it would be. LOL
 
If you don't have the tools At least you can do a mechanical sync
should get you close
 
I raced karts for many years and we always used EGT but as someone else further up the thread said, I think that's more for getting the mixture itself right, whereas syncing the carbs is to get the same volume of mixture flowing through each.
 
Use both and you will find out you will get it the best it can be,,,,You really can't sync with just EGT because of each cyclinder will never flow the same rate all the time( Carb volume, intake track, exhaust track ect). I have done total spec'd motors for Nissan and the all come out the same, until it's running ,cfm( volume) of each one could very by as much as 7% across all 4 or 10% in 6...Sync (balancing carbs is showing your flowing equal to each or pulling as some say) Here is how one guy did the Air/fuel ana on a bike.
http://www.ldrider.ca/techpages/exhaustgasanalyzer.htm
Just my 2 cents worth
 
Last edited:
you can make a manometer. you have to have 4 tubes all connected at one end, other ends to each carb, can use atf for fluid. set all tubes level. previous post shows homemade for 2 cylinder. trying to find plans for a 4 cylinder one that works. can't remember where picture is on this computer.will post if can find.
 
You must log in or register to reply here.
Back
Top