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03-03-2018, 10:47 AM | #1 |
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Dual carburetors
Is there a good information site where it explains to you how to sync these carburetors any help would be greatly appreciated thank you in advance
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03-03-2018, 11:03 AM | #2 |
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Re: Dual carburetors
The instructions that come with the carb synchronizer (the one with the bead in the tube) are pretty good.
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03-03-2018, 11:12 AM | #3 |
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Re: Dual carburetors
Agree available on eBay;
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03-03-2018, 11:31 AM | #4 |
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Re: Dual carburetors
I like this sync tool better than the old style ball type. Works really well....
https://www.ebay.com/itm/Empi-Univer...5aA6m7&vxp=mtr |
03-03-2018, 01:12 PM | #5 |
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Re: Dual carburetors
It is VERY simple. your going to adjust the idle RPM adjustment so both Carbs. draw equal venturi vacuum as measured with either of the two devices as shown above at idle. In effect both Carbs. will contribute equally to idle. If when this is done idle adj is too high than lower the idle adj. on both equally for your desired RPM then recheck and readjust. If you adjust idle mixture and the idle RPM changes, then again readjust the sync.
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03-04-2018, 09:03 AM | #6 |
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Re: Dual carburetors
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John |
03-04-2018, 09:48 AM | #7 |
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Re: Dual carburetors
John is correct, disconnect the linkage connecting the two carbs together, before starting and replace when done. If you don't then a adjustment on eather carb RPM would effect the other.
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03-04-2018, 11:09 AM | #8 |
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Re: Dual carburetors
The very first thing to do is make sure the two carbs are exactly the same, including jetting, PV, and float settings, assuming the normal straight linkage settup. If the carbs have no history or questionable assembly, run each carb on a stock intake and monitor vacuum levels during idle bleed and rpm adjustments, which should match. This will ensure the carbs will easily sync and run trouble free on the dual intake.
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03-04-2018, 05:27 PM | #9 |
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Re: Dual carburetors
Before the invention of all these tuning aides, we used to set the idle screws by running our hand over the carbs, until l they were both the same. Simple and effective,
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03-04-2018, 07:17 PM | #10 | |
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Re: Dual carburetors
Quote:
Works great for removing earwax in the event of a backfire as well!
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03-05-2018, 08:19 AM | #11 | |
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Re: Dual carburetors
Quote:
Thanks Max and 'Ole Ron, I love these old simple and effective tricks to diagnose and tune. Sal |
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03-05-2018, 07:46 PM | #12 | |
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Re: Dual carburetors
Quote:
Hahaha more like removing your ear! Im for a synchroniser and a vacuum gauge.. (and maybe the wisest move going back to a single carb ; )
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03-06-2018, 02:58 AM | #13 |
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Re: Dual carburetors
“Works great for removing earwax in the event of a backfire as well!”
You missed your calling as a standup comedian.... |
03-06-2018, 07:17 AM | #14 |
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Join Date: Jun 2013
Location: Marana Arizona
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Re: Dual carburetors
Search "unisync" on this site, lots of info.
I use a unisync because after all of these years of developing my "selective hearing" I left the hissing frequency out, Chap |
03-06-2018, 07:21 AM | #15 |
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Re: Dual carburetors
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