is there a way to slow down a pressure gauge?

taro · 08-31-2008

Like an idiot, i bought two cheapie vacuum gauges to try to sync my carbs on my parallel twin bike. Unfortunately, the needles moved so fast back and forth that I ended up just guessing as to balancing the carbs based on the approximate ranges of the swinging of the needles (they were a blur). I am going to a track day in about three weeks and wanted to take another stab at it. Is there some kind of restrictor that would prevent the needle from bouncing around so much around the dial or should I just spring for a carbtune? Thanks.

GREENISBEST · 08-31-2008

You need to restrict the airflow which will slow the response of the gauges using a damper of some sort.

Shop gauges uaually have short small bore pieces of tube that are inserted in the line between the gauges and the Vac take offs on the Carbs, 1 per line.

Older gauges employed a turn screw system that acted on the line to restrict the flow.

To give you a better idea the hole in the restricting tubes are about 1/16" Dia.

In the pic below the Damper/Restrictor is number 3.

taro · 08-31-2008

Thanks for the info. The vacuum gauge came with a connector with two male ends that looks like it could restrict some flow. I'll split the line that it came with and see what happens. Thanks again.

Charlie Gary · 09-01-2008

You might be able to choke the tubes down with some small c clamps.

taro · 09-03-2008

Thanks for the tip, Charlie. I've been messing with my brakes and pilot screws and haven't looked at syncing the carbs yet. Hopefully in the next few days.

QKENUF4U · 09-03-2008

you could get small valves from the hardware store and just adjust them till the needles stop bouncing so bad. thats how the mechanical guages i used where setup at school.

taro · 09-03-2008

Thanks for the info!

MFolks · 09-04-2008

The small air control valves for the fish tank bubblers might work as a restriction device. They are brass with a knob to limit air flow.

taro · 09-04-2008

Thanks!

rbentnail · 09-05-2008

I synch'd my throttle bodies yesterday. Used a gage for #3 and had to pinch the hose with my fingers a little to quiet the needle. Then used a Synch Pro to do all 4 together.

08-31-2008	#1 (permalink)
taro Wants better weather! BTK Expert Join Date: Nov 2005 Posts: 721	is there a way to slow down a pressure gauge? Like an idiot, i bought two cheapie vacuum gauges to try to sync my carbs on my parallel twin bike. Unfortunately, the needles moved so fast back and forth that I ended up just guessing as to balancing the carbs based on the approximate ranges of the swinging of the needles (they were a blur). I am going to a track day in about three weeks and wanted to take another stab at it. Is there some kind of restrictor that would prevent the needle from bouncing around so much around the dial or should I just spring for a carbtune? Thanks.

08-31-2008	#2 (permalink)
GREENISBEST Honest it wern't me !! Forum Supporter Join Date: Nov 2006 Posts: 1,548	You need to restrict the airflow which will slow the response of the gauges using a damper of some sort. Shop gauges uaually have short small bore pieces of tube that are inserted in the line between the gauges and the Vac take offs on the Carbs, 1 per line. Older gauges employed a turn screw system that acted on the line to restrict the flow. To give you a better idea the hole in the restricting tubes are about 1/16" Dia. In the pic below the Damper/Restrictor is number 3. __________________ END OF MESSAGE ! Last edited by GREENISBEST : 08-31-2008 at 01:02 PM.

09-01-2008	#4 (permalink)
Charlie Gary Can't find time to ride BTK Expert Join Date: May 2007 Location: Near Seattle Posts: 613	You might be able to choke the tubes down with some small c clamps. __________________ Later, Charlie ----------------------------------------- I like women plain, not battered.

09-05-2008	#10 (permalink)
rbentnail Formerly a Kaw owner Forum Supporter Join Date: Jan 2005 Location: Asheboro, NC Posts: 3,791	I synch'd my throttle bodies yesterday. Used a gage for #3 and had to pinch the hose with my fingers a little to quiet the needle. Then used a Synch Pro to do all 4 together. __________________ Russ On an foot-draggin' 07 Yamaha FJR

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08-31-2008	#3 (permalink)
taro Wants better weather! BTK Expert Join Date: Nov 2005 Posts: 721	Thanks for the info. The vacuum gauge came with a connector with two male ends that looks like it could restrict some flow. I'll split the line that it came with and see what happens. Thanks again.

09-03-2008	#5 (permalink)
taro Wants better weather! BTK Expert Join Date: Nov 2005 Posts: 721	Thanks for the tip, Charlie. I've been messing with my brakes and pilot screws and haven't looked at syncing the carbs yet. Hopefully in the next few days.

09-03-2008	#6 (permalink)
QKENUF4U AZ's Official Mechanic BTK Expert Join Date: Sep 2004 Location: phoenix arizona Posts: 3,650	you could get small valves from the hardware store and just adjust them till the needles stop bouncing so bad. thats how the mechanical guages i used where setup at school.

09-03-2008	#7 (permalink)
taro Wants better weather! BTK Expert Join Date: Nov 2005 Posts: 721	Thanks for the info!

09-04-2008	#8 (permalink)
MFolks Way Too Much Free Time BTK Expert Join Date: Jul 2008 Location: Springfield Mo Posts: 1,005	The small air control valves for the fish tank bubblers might work as a restriction device. They are brass with a knob to limit air flow.

09-04-2008	#9 (permalink)
taro Wants better weather! BTK Expert Join Date: Nov 2005 Posts: 721	Thanks!

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