I reused my gaskets. The bike only had 800 miles on it so as long as your gaskets are not burnt or you see the aluminum on there your good. Or you could go get gasket maker and put it on there if you really wanted to. But if you bike has less than I would say 1500 miles you should be definitely in the clear for reusing your old gaskets. But don't forget to check and make sure that they are not leaking later on. If they are then yeah you will need new gaskets.