Synchronous tester carburettor clock for 4 carburettors synchronising motorcycle; 4 x gauges for vacuum carburettor synchronisation; 4 x rubber pipes 750 mm Good synchronicity of the throttle valves leads to more optimal combustion. This results, among other things, less Fuel consumption, quiet engine running, low vibration in all speed ranges, good acceleration values and a higher final speed 4 gauges for carburettor synchronisation (vacuum),4 rubber tubes, 8 x 750 mm,4 extension tubes 3.9 x 52 mm and 4 tubes 3.9 x 122 mm,8 tubes with conical connector 8 x 40 mm,4 tubes 10 x 53 mm (M6 x 0.75),4 tubes 10 x 60 mm (M6 x 1.0). Perfect measurement results with mechanically engines, to be used with the engine running, suitable for cars and motorcycles. After connecting the watches to the carburettor, the measurement of the negative pressure in the intake system is possible Colour:Red Material:Metal Package Contents: 1Set x Synchronous Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.