Carb Sync Issues - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 13 (permalink) Old 09-21-2006, 12:53 AM Thread Starter
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Carb Sync Issues

I am having issues with syncing the carbs, I can get them synced at idle or they can be synced at 4000 rpm. Not both.

How in the world do you sync these things with only one screw?

I have looked to no avail about exactly how to sync these things, Does anyone have a clue?

Thanks.

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post #2 of 13 (permalink) Old 09-21-2006, 05:53 AM
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You did check THIS thread from the Vulcan Verses, didn't you?
It says the front cyl is the reference cyl, and adjustments are made only to the rear.
Other than that, I can't be of any more help. Sorry.


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post #3 of 13 (permalink) Old 09-21-2006, 11:21 AM
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hummm, not sure if a partially clogged jet would affect it... have you checked that?

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post #4 of 13 (permalink) Old 09-21-2006, 03:48 PM Thread Starter
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I have had issues util I pulled and cleaned the carbs 4 Times unti I got it to run smooth as glass.

Now I am sure there is a procedure that I am missing. There is only one screw so it would not matter which cylinder is reference as long as they are the same.

They use the front cylinder as reference for explanation, because you cannot adjust any air screws (there are none).

I am just wondering if anyone has actually done a sync and what procedure they used.

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post #5 of 13 (permalink) Old 09-21-2006, 08:08 PM
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Nope haven't done a sync, but I am going to try to get to it on Saturday... I will let you know what they do at the shop.

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post #6 of 13 (permalink) Old 09-21-2006, 11:55 PM
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If you had used seafoam, you never would have had to pull the carbs.

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post #7 of 13 (permalink) Old 09-22-2006, 02:23 AM
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Quote:
Originally Posted by dta116
They use the front cylinder as reference for explanation, because you cannot adjust any air screws (there are none).
Yes there are... idle air screws... they are under a lead plug

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Currently Installed
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westco 12v30 MF, 30A/h w/ 350 CCA's w/ custom box
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Soon to have (own or on order)
TOC ACCT's
Mez's 110-FRT 170/80-Rear
Custom rear fender and tail light
Givi hard bags w/ custom rear turn signals


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post #8 of 13 (permalink) Old 09-23-2006, 01:28 AM Thread Starter
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Actually Hizzo.... They adjust the Fuel at idle, not air...

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post #9 of 13 (permalink) Old 09-23-2006, 01:45 AM
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Sounds like you already have a manometer to measure the difference between the front and rear cylinder and you know how to read it, so I'll skip some of that. Set the idle speed first. Check the gauge readings. If the difference is less than 2 cm Hg, the carburetors are considered synched. If not, the carburetor butterfly adjuster bolt on the rear cylinder is adjusted. Turning it in will increase vacuum in the rear cylinder and turning it out decreases it. After the vacuum readings are close enough, the idle is checked again.

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post #10 of 13 (permalink) Old 09-24-2006, 10:46 PM Thread Starter
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Thanks Ironman, I have done exactly that....If I increase Idle to 4000 rpm, The sync is off by quiet a few inches (on a yard stick). So, I either set it for idle or set it for 4000...See my delima?

Thanks

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