DAYUAN Motorcycle Vacuum Carburetor Synchronizer Tool Kit Carb Sync Gauge

Good for the money.

Went into this reading the reviews and assuming like many things that with a bit of care it would probably be alright. Carefully Loctited in metering jets, gently adjusted gauges so they were synced, then tried to use it on my good running 2014 FJR1300 motorcycle to dial in the throttle bodies as part of a normal service. Nope, it is complete and utter junk. Needles nowhere near each other and bouncing all over. Even when you switch the lines the needles don't change general area but remain wildly uncalibrated. . This thing is total garbage and sadly I didn't get a chance to test it until after the return window closed, so I am out the cost of this useless paper weight. Might be ok for some sort of steampunk cosplay, definitely of no use at all for any mechanical purpose.

This is an absolutely smoking deal for what you get. You get a set of gauges attached to nice aluminum backplate, four vacuum hoses, vacuum restrictors to place inline and a case to keep them all. The gauges should be centered and zero'd before use which you can do via a flathead in the gauge face. They've traveled a long way, so reset them. You should also check the tension of the restrictiors at the base of the hose inlet at the bottom of the gauges, they're shaped like pilot jets. If you do all of these things, these gauges work fine and you can sync you carbs. For the people that didn't follow these steps, you will get all of the negative reviews.

Works as it should, only needed two gauges due to having two carbs. Unfortunately one of them did not work the greatest but was able to get the job done.

The adjustment screws are stiff. Use a screwdriver that fits. It takes very little movement to move the needle. Once all 4 read the same, it was quite simple up synch the carbs on my motorcycle. When you install the brass tubes to your intake holes, be sure to attach the rubber hoses FIRST. You don't want to break off the brass tubes in the carb manifolds.

these have an internal damper for the needles, instead of adjustable ones like you get on the slightly more expensive models. This means you just have to hope the factory calibrated them correctly, which on mine was true for only two of the gauges. The other two were so loose as to be unusable. Luckily I could still tune my 4 carb bike with only two working gauges, it just took longer and was a bit of a pain. spend a few extra bucks and get an adjustable one, unless you're willing to chance it like I was

Works

Broken and doesn't work straight out of the box, only 2 worked and the needles bounce to much to even read. There's no way to adjust and the screws dont do anything. I should have trusted the reviews...

Used this to sync the throttle bodies on my yamaha, didn't need the brass attachments the hose just connected straight to the nipple by the throttle bodies. One of the gauges wasn't zero'd completely so I didn't need that one.

So tried these out and they immediately broke, not sure what else to say they work when first out on then the needle moved to the middle of the dial and just stopped responding- feels like this is just junk

Très bon produit et à bon prix.

For an inexpensive gauge set they worked well - I had no problems calibrating them. Delivery was on day promised.

One of gauges had a mind of it's own. Once vacuum introduced, gauge decided to rotate counter clockwise x 2 rotations. Now fixed in that position = USELESS