Pictures to help with synchronizing your carbs - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 11 (permalink) Old 04-13-2009, 10:05 PM Thread Starter
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Pictures to help with synchronizing your carbs

I had the carburetors off the project bike tonight and decided to take some pics of the idle adjust and carb sync screws. Also tried to demonstrate how to visually sync the carbs before putting them on the bike, but couldn't quite manage to do that. So I tried to offer descriptions for each picture about the steps to take while synchronizing. I can add pics when I hook up the manometer, if anyone would find that helpful. But hopefully these will help folks visualize what's going on - or needs to go on - when the carburetors are being synchronized. Let me know if I missed anything or if you have questions that maybe I should address in this album.

https://www.vn750.com/photopost/showg...655&ppuser=962

C
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post #2 of 11 (permalink) Old 04-13-2009, 11:54 PM
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sweet! I feel stupid...
I am guessing syncing is done with the carbs on the bike? so....
so I just set the idle adjust knob to around 1100 rpms, then adjust the carb sync screw until the vacuum is equal? now to figure out how to measure the vacuum/ get it equal...lol... that's where the feeling stupid part comes into play...

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post #3 of 11 (permalink) Old 04-14-2009, 12:02 AM
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I know that there are some posting on here how to do it. just a matter of looking. I learned how to sync carbs off this site here. twins are pretty much all the same, just easier then 4's.http://faq.ninja250.org/wiki/How_do_...carburetors%3F the apparatus they make here is pretty cool and does the job very well. The only thing they forget it that with our bike you need a 't' for the hoses, but the instructional matter on our site covers that.

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post #4 of 11 (permalink) Old 04-14-2009, 12:54 AM
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Quote:
Originally Posted by Jace Bror View Post
I know that there are some posting on here how to do it. just a matter of looking. I learned how to sync carbs off this site here. twins are pretty much all the same, just easier then 4's.http://faq.ninja250.org/wiki/How_do_...carburetors%3F the apparatus they make here is pretty cool and does the job very well. The only thing they forget it that with our bike you need a 't' for the hoses, but the instructional matter on our site covers that.
Jace, if i remember correctly, the T is to supply vacumn to the petcock so that fuel will flow, correct? If you have a vacumn pump or a medium sized syringe, you can create vacumn for the petcock without a T.

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post #5 of 11 (permalink) Old 04-14-2009, 06:27 AM
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post #6 of 11 (permalink) Old 04-14-2009, 06:54 AM Thread Starter
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Quote:
Originally Posted by OlHossCanada View Post
Jace, if i remember correctly, the T is to supply vacumn to the petcock so that fuel will flow, correct? If you have a vacumn pump or a medium sized syringe, you can create vacumn for the petcock without a T.
THat's right. I'll take some pics of my homemade manometer and add 'em to the album. I guess that part is often just as confusing as which screw to turn and when.

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post #7 of 11 (permalink) Old 04-14-2009, 08:36 AM
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Cindy -

Great idea, seeing those screws and understanding which way does what is really difficult when mounted on the bike in the abyss between the cylinders.

Jon

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post #8 of 11 (permalink) Old 04-14-2009, 08:38 AM
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Quote:
Originally Posted by OlHossCanada View Post
Jace, if i remember correctly, the T is to supply vacumn to the petcock so that fuel will flow, correct? If you have a vacumn pump or a medium sized syringe, you can create vacumn for the petcock without a T.
Yes, the "T" is for the fuel flow. From my experience, you need the bike running long enough to be at operating temp, then have to shut it and start it several times while making the adjustment. I think the "T" is the only way to go.

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Dunlop D-404's
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post #9 of 11 (permalink) Old 04-14-2009, 08:44 AM
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Quote:
Originally Posted by 99vulcan750 View Post
sweet! I feel stupid...
I am guessing syncing is done with the carbs on the bike? so....
so I just set the idle adjust knob to around 1100 rpms, then adjust the carb sync screw until the vacuum is equal? now to figure out how to measure the vacuum/ get it equal...lol... that's where the feeling stupid part comes into play...
I used a yard stick with clear tubing on it. The bottom of the yard stick has the bottom of the "U" you make in the tube with the two ends going up the stick. Pour some 2 cycle oil into the tube so that you get perhaps half way up the yardstick on both sides.

Then connect the ends of the tubes to the two vacuum ports on the carbs. (splicing in the "T" on the left side).

When you start the engine, the carb with more vacuum will pull the 2 cycle oil up that sides tube. The secret is to make VERY small adjustments to the balance screw until the two sides are level in 2 cycle oil height.

Remember you are balancing the carbs, not setting a vacuum amount.

Speaking of a picture being worth a 1000 words.....http://zoic.org/sharkey/moto/r100gs/redneck.html

Jon

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Rick's Stator and R/R
MF AGM Battery
Coastered
Degoated
Shaved & Jetted
Iridium's
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
Stainless Steel Brake Lines
Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)

Last edited by 93VN750; 04-15-2009 at 12:51 PM.
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post #10 of 11 (permalink) Old 04-15-2009, 08:24 AM
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Quote:
Originally Posted by 93VN750 View Post
Cindy -

Great idea, seeing those screws and understanding which way does what is really difficult when mounted on the bike in the abyss between the cylinders.

Jon
+1

Quote:
Originally Posted by 93VN750 View Post
I used a yard stick with clear tubing on it. The bottom of the yard stick has the bottom of the "U" you make in the tube with the two ends going up the stick. Pour some 2 cycle oil into the tube so that you get perhaps half way up the yardstick on both sides.

Then connect the ends of the tubes to the two vacuum ports on the carbs. (splicing in the "T" on the left side).

When you start the engine, the carb with more vacuum will pull the 2 cycle oil up that sides tube. The secret is to make VERY small adjustments to the balance screw until the two sides are level in 2 cycle oil height.

Remeber you are balancing the carbs, not setting a vacuum amount.

Jon
+1 & good info.
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