Prokomon Motorcycle Carb Synchronizer with 2 Gauge Carburettor Vacuum Balancer Synchronizer

first off start with valves CLOSED than OPEN valves on hoses VERY SLOWLY till needle/s STARTS to MOVE than your in business..synced my dual carbs once adjusted when both needles matched up , you can hear it purrrrrrrr ...cold start up muchhhh better, fuel economy up as well all around better performance with synced carbs (96 honda shadow 600)valve adjustment + synced carbs made HUGE difference getting 50mpg.CHEERS ALL -hoped that helped

Synced the carbs on my V-Star 650 and was actually shocked how much better it runs. Snappy throttle! Idles better.I’ll sync my carbs regularly now.Kit is good quality.

Gage is worked but got stuck first time it was used. Maybe good for steady vacuum but for an engine that pulsates this will not work. Waited past the 30 day window to return it and can contact the seller or Amazon through the app or website. It’s giving me the circle jerk options that don’t help. Do yourself a favor and buy the motion pro vacuum tester. You get what you pay for and I had low expectations to begin with

When I got the gauges one of them had the needle off of 0 the other one was dead on 0. I adjusted the needle as the instructions provided showed and centered the needle on 0 however when you then use the gauge with a vaccum it gives a reading that is inaccurate and when the vaccum is released the gauge doesn't return to 0 but stays at the false reading. Inaccurate and useless however the other gauge is useable and returns to 0 but I'm sceptical on the accuracy with the issue of the other gauge.

Bought to sync the carbs on my 82 Yamaha Virago 750. The valves are tricky to dial in. After plugging them into vacuum ports (and during idle), I had to completely unscrew the supplied valve, plug that hole with my finger, and wait until the needle started bouncing back and forth rapidly across half the dial. At that point, I replaced the supplied valve screw and turned it in (clockwise) until the bouncing dropped to just barely moving in the center of the extremes it was moving between before. Did that for both. Had to redo it a few times while I played with the sync screw on the carb because the needles seem to get unaligned easy and need to be readjusted with the supplied screwdriver. Eventually, between fiddling with the carb sync screw and the gauge valves (and a lot of triple checking), I was able to sync my carbs. Engine runs great now. Sometimes the needles would get way off and the adjustment screw wouldn't turn far enough to fix it. To get them back, I gently slid/moved them back and forth a few times until they seated close to zero, and then used the adjustment screw to zero them back in. Some reviews mention that problem and I found just gently moving them one way or another in small amounts seemed to reset them close enough to readjust and work again. Overall, you get what you pay for. Higher priced gauges might be more reliable, but these worked for me with the tips above, and I'll keep them handy in my toolbox until I need them again. Hope this helps.