How can I Zero the gauge, how do I get to the adjustment screw?

These guages cannot be zeroed. What you must do is make a note of the vacuum reading after connecting all guages to a single source (using various T-pieces to split the vacuum tube into four tubes). Then you know how far out each guage reads. Check out youtube for more.

Does this have a 5mm adaptor for a 1981 Cb900f Honda

The kit has a number of different length tapered brass fittings, designed to be pushed into vacuum hoses, rather than screwed into the carb housing.

Will this be okay for a kawasaki zx6r 2000? thanks

I am not sure as we bought it for a Pan European, different machine but the quality of the item is excellent Thanks

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⛽ Tune like a pro, ride like a legend!

QUAD CARB PRECISION - Synchronize all 4 carburetors simultaneously for peak engine harmony.
PORTABLE ORGANIZED - Heavy-duty blow-mold plastic case keeps your tools secure and ready for on-the-go tuning.
ROBUST VACUUM GAUGES - Four 1/2" synchronizer gauges with fixed plates ensure accurate vacuum readings every time.
UNIVERSAL COMPATIBILITY - Designed to fit popular models like GS, KZ 550, 650, and 750, making it a must-have for serious riders.
COMPREHENSIVE TUBING SET - Includes multiple extension and connector tubes for versatile fit across Honda and Yamaha models.

The DAYUAN Motorcycle Fuel Vacuum Carburetor Synchronizer is a precision tool kit designed to synchronize and adjust up to four carburetors simultaneously. Featuring four vacuum gauges, a comprehensive set of extension and connector tubes, and a durable carrying case, it fits popular Honda and Yamaha models such as GS and KZ series. Perfect for professional-grade tuning and maintenance, this kit ensures optimal engine performance and smooth rides.

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