Carb sync tools - what's better, the cheap gauge model or Motion Pro fluid type?

[posplayr]

Bought a unit from E-bay a few months ago.
It is one vacuum gauge hooked up to a manifold.
The manifold has been drilled and tapped to accept needle valves.
You open each valve with the corresponding dial on top.
Therefore you never need to sync the gauges as you are using the same gauge for each carb.

I was going to buy the carbtune pro when one of these came up for auction.
Mine is the same except for the mounting position and my numbers are read while side-ways from the one pictured.
It is meant to be permanently mounted on your bike.

I paid around $25. for mine in the same if not better condition then this one.
The one pictured below was up for auction for a unremembered by me ridiculous price.

To me it looks like something that could be duplicated at home if somebody was to put their mind to it.
Not necessarily with the same materials.
Simple inline valves for each hose.
Possibly a section of PVC pipe capped as your manifold.

There cannot possibly be a good reason to try and duplicate this design. You would be better off using a differential pressure gauge to compare two port pressures at a time.

I would create a manifold for 3 ports (use vacuum "T"s and JB weld to create a bleeder; drill to about 1/16") to serve as a reference and then the 4th would be the one to be adjusted. You adjust the 4th till it is in line with the average of the others, keep going around till you are done.

The best is to see all 4 at once and adjust one at a time to be in line with the rest, but that costs and extra $40.


http://www.ebay.com/itm/DWYER-DIFFE...SIG-MAX-NEW-/151801520371?hash=item23581360f3
http://www.ebay.com/itm/NIB-Parker-...6f4cf51&pid=100009&rk=1&rkt=1&sd=262009030900

FYI, I posted this to help satiate the miserly tendencies of the populous.

http://www.thegsresources.com/_foru...75-Poor-Man-s-Carb-Sync&p=2222453#post2222453

 

[Katarat]

Do you have a make & part number for that adjusting screw driver ?

 

[cowboyup3371]

Do you have a make & part number for that adjusting screw driver ?

Here's one from Z1

http://www.z1enterprises.com/ItemDe...ption=Carb+Adjustment+Tool+Set&item=TU15-0469

 

[mikerophone]

And here is one on Amazon Motion Pro PN 57-8022 $23

 

[Katarat]

Thank you !

 

[Steve]

Bought a unit from E-bay a few months ago.
It is one vacuum gauge hooked up to a manifold.
...

If you have ever watched a carb sync done with a 4-gauge setup (that includes the 4-column liquid ones), you should have noticed that when you turn one sync screw, the level changes on all four.

If you use a single gauge (as pictured) with multiple valves, your fingers will be worn raw with all the valve turning that you will have to do. Lets say that you look at #3 (the master carb on a set of BS carbs) and see a reading of "10". You then look at #2 and see "15", so you turn the sync screw until it also reads "10". However, if you go back an look at #3, it will no longer read "10", so you will have to note its reading, then go back and adjust #2 to match. It will take several attempts to get those two carbs to agree with each other.

Then you proceed with #1.

You finally get to do #4.

You may think "once #2 and #3 agree with each other, nothing else will change that", but you will be wrong.

Using a 4-gauge setup, I could do a full carb sync, remove the adapters and be half-way around the block before you got the first two carbs to agree with each other. :-\\\

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