Step one, go onto the ski doo website and get part number for the gasket and buy new gaskets, step 2, study parts diagram, step three pull apart one at a time and be sure that you put the same valve back into the cyl that it came out of. Be very careful not to lose any springs. It is a pretty simple thing to do, just pay attention to what comes out and where it goes back in. when cleaning them, use brake clean or engine degreaser and a soft cloth, try not to scuff them up too bad.
