TOPIC:

Just purchased a vaccum gauge style carb sync tool made by emgo company looks fairly legit wanted to get some feedback if anyone ever used it and if it was a bum purchase or good one.

Does it look like this?

CoreyClough wrote:

Does it look like this?

Don't you have to calibrate those? I need a set and was looking at that specific one.

Could attach each gauge to the same carb, and compare readings among the gauges to determine equality of indicated measurements on the known identical vacuum.

Good Fortune!

I have the one's that are pictured. I did have to "zero" them out before first use. Also, I replaced the hose's that came with them for better quality hoses from the local auto parts store. The original ones started to split when installing on fittings.

whats involved in zeroing them

jus1975 wrote: whats involved in zeroing them

there should be a screw or something on the back

Do you have to connect them to an air source first to get them in together or just turn till the needle is on zero

You can use the T's and some extra line to connect them all down to one hose. Then just use a constant source of vacuum (carb w/engine running is too bouncy) and get the needles up about 1/3rd the guage, then calibrate them and repeat a couple times to ensure accuracy.

Good luck.

I've used a small shop vac to calibrate a similar tool. It wasn't specifically for a bike but it was still a manometer. I drilled a hole in the center of the cork then forced / glued a tube in it. At first it pegged the gauge so we stuffed some rags into the shop vac's air exit to help bring it down to a useable level. We also put a fan on the shop vac to help it keep from getting too hot.

Just throwing that out there.

I own 2 sets of vintage Motion Pro Mercury Synch gauges. They are 4 very small ID plastic tubes attached to a board with graduations. They use Mercury in a small "tank" at the botom of the set of tubes. Mercury can be difficult to replace now since it is very difficult to buy in most places.
Motion pro makes one still, but it uses a blue fluid in it instead of mercury, they dont want us to hurt ourselves after all. I have no idea how the new style works, but the mercury type are extremely accurate and require zero calibration.
motionpro.com/motorcycle/partno/08-0411/

The dial type gauges must be calibrated even when the temperature changes, and that is a pain in the ass IMO.

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