If the engine was stuck, you'll want to pull the back cover and make sure the rod slides freely on the wrist pin. It's very common for the rod to stick to the pin, and it'll make a noticeable difference in how a Fox 35 runs. If it is stuck, a little heat from a heat gun to melt the old castor, followed by some after run oil, usually does the trick. Don't forget to either replace the backplate gasket, or seal it up with RTV, as they don't run well with leaks either.