Hi James;
> $30 Carb Sync tool
>
> James O'Gorman <[email protected]> Jul 27 10:19PM -0500
>
> There is often talk about carb syncing on the forum.
>
> I synched my carbs last week on my 83 650 using a UniSyn tool
> that I borrowed from a friend. It was REALLY easy. Really. This
> should not be a job that anyone is afraid of like I used to be.
>
> I was using a tool like the following:
>
http://www.newegg.com/Product/Product.aspx?Item=9ATBDVJ0044339&nm_mc=KNC-GoogleAdwords&cm_mmc=KNC-GoogleAdwords-_-pla-_-NA-_-NA
>
> For $30, I think I'm going to pick one up even though I don't
> really need one anymore.
>
> Its not set of Vacuum gauges like I was expecting, but the
> old-timer that let me borrow it told me he used to sync old
> Porches and Lamborghini's with it (and yes, he really did work
> on that type of car back in the day).
>
> When you reassemble the bank of carbs, just do a baseline sync
> by looking through the carbs and adjusting the butterflies so
> you can see equal amounts of light under each one. Then get the
> bike back together and use the sync tool.
>
> On the downside, to use this you have to remove the boots on the
> intake of the carbs. This is more work than just plugging into
> the vacuum ports on the boots, but it does the trick.
>
> - James O'Gorman
This is the tool I use also.
Basically it measures the air flow DIRECTLY.
This is what you are attempting to do anyway.
Technically this to doesn't make absolute flow measurements.
But it makes very accurate air flow comparisons.
And quite sensitive too.
The direct reading air flow tool has essentially no errors.
The vacuum gage method measures air flow INDIRECTLY.
This assumes the vacuum ports are clean and the geometry
of the ventures are all identical. So any imperfections
can cause sync errors to creep in.
And yes, I have had mine since 1971 or so and used it on
multi carbureted race engines. Never failed me.
I still use it on my Datsun 2000 SRL311 roadster, competition
150 hp version, which has dual side flow Mikuni/Solex constant
velocity carbs.
Even if you still want to use the vacuum port method, which
is admittedly easier to do, you should at least calibrate the
gages using the airflow toot. You might be surprised at how
much error there is.
Duane
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