| Hi
If the cyclinder base gasket is leaking I would check the security of the cyclinder bolts and studs its unusual for these to leak unlesss something has changed.
I remember many moons ago having a 900SL wth a similar problem and it was the Oil pressure switch the oil was runing up inside the cable insulation and dripping out under the tank onto the crank cases (strange but true lol).
I like the idea of Ducman851's thats what I would do after all there are really only a few places the oil will come from.
Regards
Dave O | 
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