The 1977-1979 Suzuki GS1000 Fours repair manual by Haynes, covers the following street bike models:

• Suzuki GS1000C, U.S. only 1977
• Suzuki GS1000EC, U.S. 1977, U.K. 1978
• Suzuki GS1000HC, U.K. only 1978
• Suzuki GS1000N, U.S. only 1978
• Suzuki GS1000EN, U.S./U.K. 1979
• Suzuki GS1000L, U.S. only 1979
• Suzuki GS1000S, U.S./U.K. 1979

Book Excerpt: 1977-1979 Suzuki GS1000 Fours Repair Manual ENGINE, CLUTCH AND GEARBOX

DISMANTLING THE ENGINE UNIT REMOVING THE CRANKSHAFT AND GEAR SHAFTS

1. Grasp the crankshaft with both hands and lift it upwards, out of the casing, as a complete unit, together with the oil seals and the cam chain. If the crankshaft is firmly seated, use a rawhide mallet to free it from the casing. Note the main bearing outer race location pins in the upper crankcase half. If they are loose, remove them with a pair of pliers.
2. Lift out the two gearbox shafts individually, complete with pinions and seals. Note the positions of the bearing location half clips, which prevent axial movement, and pry them from position. The two shaft assemblies should be put to one side for further attention at a later stage.

REMOVING THE GEAR SELECTOR INTERNAL MECHANISM

1. Withdraw the selector fork rods towards the primary drive side of the engine, and displace the selector forks. There are two rods, of which the front carries one fork and the rear two forks.
2. The cam stopper arm pivots on the forward rod. The arm return spring is hooked over the rear rod.
3. Remove the neutral position drum detent housing bolt and displace the detent spring and plunger. The change drum can now be pulled out of the casing towards the primary drive side of the engine.

ELECTRICAL SYSTEM

STARTER SOLENOID SWITCH: FUNCTION AND LOCATION

1. The starter motor switch is designed to work on the electro-magnetic principle. When the starter motor button is depressed, current from the battery passes through windings in the switch solenoid and generates an electro-magnetic force which causes a set of contact points to close. Immediately the points close, the starter motor is energized and a very heavy current is drawn from the battery.
2. This arrangement is used for at least two reasons. Firstly, the starter motor current is drawn only when the button is depressed and is cut off again when pressure on the button is released. This ensures minimum drainage on the battery. Secondly, if the battery is in a low state of charge, there will not be sufficient current to cause the solenoid contacts to close. In consequence, it is not possible to place an excessive drain on the battery which, in some circumstances, can cause the plates to overheat and shed their coatings. If the starter will not operate, first suspect a discharged battery. This can be checked by trying the horn or switching on the lights. If this check shows the battery to be in good shape, suspect the starter switch which should come into action with a pronounced click. It is located under the dual seat, close to the battery, and can be identified by the heavy duty starter cable connected to it. It is not possible to perform a satisfactory repair if the switch malfunctions; it must be renewed.

Subject: 1977, 1978, 1979 Suzuki GS1000 Four service, maintenance, repair. ISBN-10: 0856964840 | ISBN-13: 9780856964848 | Haynes 484