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Home Made Vacuum Gauge Carb Synchronizer

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  • Home Made Vacuum Gauge Carb Synchronizer

    Home Made Vacuum Gauge Synchronizer
    by Bill Murrin

    I have made a cheap carb synchronizer out of a vacuum gauge, 3/16ths" tubing, four screw aquarium valve and a home made plenum. The gauge($8) is from Harbor Freight and the aquarium valve($4) is from my local fish store. The plenum tank is just PVC pipe with a couple of brass taps screwed into it($3). The plenum was used to
    dampen the fluctuation of the needle on the vacuum gauge.

    Click image for larger version  Name:	20020830-mysyncrotool.jpg Views:	0 Size:	83.1 KB ID:	860322



    Here is one of the brass plenum fittings:

    Click image for larger version  Name:	20020830-brassplenum.jpg Views:	0 Size:	31.9 KB ID:	860323



    Closer shots of the gauge and valve:

    Click image for larger version  Name:	20020827-synchrovalve.jpg Views:	0 Size:	81.6 KB ID:	860324



    Click image for larger version  Name:	20020830-gaugeinuse.jpg Views:	0 Size:	100.4 KB ID:	860325



    Operation: Adjust each carb by turning on the valve that is connected to it's manifold while the other three are closed. This takes a little longer than the mercury sync but it is cheap and you can open the throttle as much as you like without worry of ingesting mercury.

    Click image for larger version

Name:	20020830-synchroinuse.jpg
Views:	234
Size:	81.7 KB
ID:	860326

    If I had it to do over again I would make the plenum out of larger diameter PVC and have a threaded cap on one end so all the parts would fit inside.
    Last edited by tplank; 11-01-2020, 04:13 PM.
    Bill Murrin
    Nashville, TN
    1981 XS1100SH "Kick in the Ass"
    1981 XS650SH "Numb in the Ass"
    2005 DL1000 V-Strom "WOW"
    2005 FJR1300 Newest ride
    1993 ST1100 "For Sale $2,700" (Sold)
    2005 Ninja 250 For Sale $2,000 1100 miles
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