My cases are split so that I can work on the tranny, but the whole top end is intact. The literature says to replace the crank shaft seal when you split the cases because that's the only way it can be done, and you won't get the chance again. But that same literature is referring to an entire engine rebuild complete with head and cylinder removal. Does anyone know for sure if you can replace the crank seal without removing the head? Specifically, will the cam chain allow me to lift the crank shaft enough to remove and replace the seal? I'm thinking the cam chain probably has some slack from use, and I can back the cam chain adjuster way out. But if it's not possible I don't want to disturb and possibly mess up the old seal.