id replace all the seals in the bottom end, it dont cost much and it gives you peace of mind. send your crank to kevin herr @ herrjugsracing.com and have him weld it and im sure he can check it to make sure its good to go, along with the crank he can also do your cylinders. if you want to make some serious power he can port them for whatever riding you do. good luck! its definitly worth rebuilding.