Professional comprehensive vacuum type carburettor synchronizer (balancer) tool to test both mechanical and electrical fuel pumps. Feature 4 gauges with lockable valves enabling to hold vacuum values in use for testing 2 and 4 cylinder petrol engine fitted to motorcycle, motorbikes, etc. Set includes different adaptors for easy-access between the tubes or wires around the carburettor, quick release fittings and delivery tube (4x750mm long). Checks for worn or defective parts in fuel pump and vacuum system. Diagnose improper timing, burned or stuck valves, leaking manifolds, improper fuel mixture, stocking choke etc. Supplied in carry case.