Hi, easy job, if your bike is waer cooled, you dont say how old it is the old bikes were air cooled, undo all the water pipes attached to the r/h case all the water will escape, you can leave the oil inside the gearbox, if you lay the bike on its left hand side, lift the engine and block it up to make sure gear lever is not resting on the ground, as this will disengage when you remove the clutch cover on the r/hand side, undo all the fixing screws from the cover remove kickstart lever, tap the cover gently to loosen the cover and remove when loose, if the case will not come off check further for screws, sometimes hide inside water pumps etc, once you are ready to remove the cover, keep the kickstart shaft pushed inermost so that it stays located within the engine, once ready fully observe the location of spring mountins within the engine and replace the spring