This original manual published by Suzuki in 1980 covers all the service data necessary for a dealership to service the GSX400, GSX400L, GS450 and GS450L twins, and the GS550, GSX550L, GSX750, GSX750L, GS850, GS850L, GS1000, GSX1100 and GSX1100L fours. As such it is a vital item of informative literature that provides the tolerances for wear in the engine and chassis, such as the crankshaft, bearings, pistons, rods, camshafts, valves, gearbox, clutch and gearbox and final-drive sprockets and chain. It also covers test data for the electrical systems, brakes, wheels and suspension. The book was published by the Service Department of Suzuki's Operations Division in January 1980 under part number SD-0001 E-01. This manual is a must-have for any enthusiast, collector, or mechanic working on these machines.