Well if the gasket comes off with out being torn or ripped you can reuse (new gaskets come off easier, if it leaks then you can get another but most likely won't if comes off cleanly). as for the clutch, there is a rod with the philips head and lock nut in center of the pressure plate that holds the springs. clutch lever on the left side of motor should point at a mark on the case under were the carb sits. that would be the base setting, other wise I'd say your clutch cable needs lube or replacing if it's stiff to pull on. Hope this helps with what you need.