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Old 09-03-2002, 11:27 AM
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nashville_bill nashville_bill is offline
XSive Maximus
Join Date: Jul 2002
Location: Nashville, TN
Posts: 604
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.

Here is one of the brass plenum fittings:

Closer shots of the gauge and valve:

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.

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.
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

Last edited by crazy steve; 02-23-2012 at 07:31 PM.

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