jasperjay

Hi, I have just aquired a 57 ajs ms18 500cc. It leaks pretty badly from the steel crank case side. Are there any tips on a cure for this or is it just a case of replacing the seal. The bike had been stood for over a year and had wet sumped most of the oil into the sump. I drained it and refilled the tank. Could some engine oil have overspilled into the primary and be causing the leak?