Prokomon Motorcycle Carburetor Synchronizer Tool; Carb Synchronizer Tool with 4 Gauge; Vacuum Carb Sync Tool for 2 Cylinder or 4 Cylinder

I've had good experiences with this set of gauges. Everything arrived in good condition and in the correct quantities. A little bit of cardboard got stuck in the gauge's inlets, but that was easy enough to clean out.A few notes:As noted in other posts, there are small brass restrictors which are screwed into each gauge's inlet pipe. They might have loosened up through shipping, so be sure to tighten them back in using a small flat-blade screwdriver. I also added a tiny bit of removeable threadlocker to each one. If those restrictor orifices are not used, then the gauge needle will swing much wider with each pulse of vacuum. With the restrictors in place, the needle wobble is easily manageable, just know that there will be a small time delay in the gauge movement.You can calibrate the needle up or down so that each gauge reads the same. When turning the small silver adjuster head to make changes, use very small movements. The adjuster can only rotate a small amount, roughly 1/8th of a turn in either direction. Contrary to how it looks, it is not a screw head, and can't come out. If you try, it will break.The adjuster will be fairly tight, but will turn. If it's too sticky, try turning in each direction to free it up. Rotate the adjuster in the opposite direction that you want the needle to adjust. If you want the needle to move to the right (clockwise), turn the adjuster to the left (counterclockwise).

Works good to get your carbs Synced, only works for certain carbs

it came in a little late had to zero out one guage but for the money it worked just fine

Do not buy these gauges!!!!! BE AWARE!!! They dont pin or loctite the jet inside the barb fitting ....How do I know that? Well the Vac gauges I purchased from this seller , one of those jets came out and was sucked into my engine...... My fault for buying this cheap garbage!

I got this thing in, one of my cylinders was reading 0 pressure. I went back and forth trying to figure out what was wrong with my engine for about a half hour before I had the thought to check the brass pipe fitting. It was clogged with some kind of white powder that was caked into the tube. I knocked it out with a punch, and now the thing works, but I'm leaving this as a 1 star review because not catching a clog in a pipe designed for measuring vacuum pressure through QA is insane.

Fast shipping

I liked the price, the guages are quality. Never balanced carbs before this, but got great results on a 4 carb motorcycle. I had the job done in an hour and that's with playing with it some. At the time this was the cheapest set on Amazon but I am happy with it.

Having four gauges makes balancing the carbs much faster than fiddling with a single gauge and multiple valves, but some things to check first. You have to zero the gauges manually by turning a screw under the front cover. I also cross checked by plugging each gauge into a known vacuum source before use to make sure they all read reasonably closely under vacuum. Note, there is also a small brass insert in the hose port that you should either screw down snuggly, or remove from all four gauges. The insert is an orifice that smooths out the reading, especially at idle rpm, but adds a bit of lag for the gauge to reach the true reading. Your choice on how you want to use it. As received, some of the inserts were not seated and some were. One star off for no directions.

I'm giving 5 stars as it came next day and my carbs are now synced and the bike is finally working perfect. The plastic vacuum valves are pretty chintzey, but so it the price. Best $40 I've spent this year!

Not accurate. Different reading every time

Works fine comes with a decent bit of line

Did some research on various gauges. for this price I will be able to use when the carburetors go back onto my motorcycle.

adjust guages when they arrived ,very important if you want correct reading, small screw under dial , tuned my 3 cylinder merc motor , idles perfectly , also goes 4 kmh faster