Txt pro clutch overhaul in Gas Gas Posted December 22, 2020 · Report reply Hi. I am trying to improve the clutch I’m my sons 2012 txt pro. I have measured the clutch plate pack thickness and it is within spec. So I am going to replace the master cylinder and seals in the slave. Can anyone confirm that I need a mineral fluid master cylinder and seals. also if I have the thicker metal clutch cover gasket would this make a difference in clutch operation. ( being thicker than the paper gaskets) thanks in advance.