Alltooetools Universal Vacuum Carburetor Synchronizer Kit — 4‑Gauge Set, 0–70 cmHg, Case Included

This professional-grade synchronizer kit supplies four precision vacuum gauges, hoses, adaptors and connectors in a durable storage case so you can perform dynamic carburetor balancing on motorcycles and other multi‑carb engines. The gauges read 0–70 cmHg (0–30 inHg) and each gauge includes damping and calibration controls to fine-tune needle response while the engine is running.

How does this kit help my multi‑cylinder motorcycle perform better?

When each carburettor in a multi‑cylinder engine draws the same vacuum, throttle response becomes more predictable, idling is smoother, and power delivery across the rev range is more even. Static throttle stop adjustments aren’t enough; this kit lets you perform dynamic synchronization while the engine is operating.

• Four individual gauges let you compare each carburettor simultaneously
• Adjustable damping reduces needle flutter for accurate readings
• Includes long and short adaptors to reach difficult manifolds
• Calibration screws let you zero each gauge before use

What’s included and how do I connect the hoses?

The kit arrives with four Ø92 mm pressure gauges, four rubber hoses (8×5×750 mm), multiple extension tubes and two sizes of threaded connection pieces. Use the provided connectors and extension tubes to match your carburetor vacuum ports and secure hoses with the included clamps.

• 4 × Ø92 mm vacuum gauges mounted to a plate for stability
• 4 × 750 mm rubber hoses plus 3.9×52 mm and 3.9×122 mm extensions
• 4 × 53 mm (M6×0.75) and 4 × 60 mm (M6×1.0) connection pieces
• Hose clamps and spare washers for leak‑free connections

How do I get accurate readings and maintain the gauges?

Always zero the needles before each use by opening the metal cap and turning the calibration screw with a flat head screwdriver. Perform synchronization while the engine is warmed and idling; the damping control on each gauge helps stabilize the needle for repeatable adjustments.

• Warm the engine to operating temperature before synchronizing
• Calibrate each gauge to 0 with the screw under the cap
• Use damping to steady needles, then adjust throttle linkages to match values
• Store gauges in the supplied plastic case to protect lenses and mechanism

Can this kit be used on other vehicles besides motorcycles?

Yes — the Alltooetools synchronizer works with most standard 2–4 carburetor systems and can be adapted to small engines, race cars, or A/C vacuum motors that require vacuum balancing. The selection of connector sizes and extension hoses gives broad compatibility with common carburettor fittings.

• Designed for motorcycles including GS, KZ, CB series and similar multi‑cylinder engines
• Compatible with many 2‑ and 4‑carb setups on small vehicles and engines
• Adapters and extensions increase reach and fitment options
• Not intended for sealed high‑pressure systems beyond specified vacuum range

Who is this for: this Alltooetools synchronizer kit is for mechanics, restoration hobbyists, and motorcycle riders who service their own machines and need a reliable, repeatable way to balance carburettors. If you work on multi‑cylinder carbureted engines and want clearer throttle response, easier tuning, and a professional toolset stored in a hard case, this kit is built for that purpose.