Oil Leak

[old son]

I have an oil leak that seems to be coming from the area around the bottom of the casing that has the gear change spindle coming through it. If it's the gasket that has blown then I presume I can do this with the engine in-situ? Why would this gasket blow for no obvious reason?


Is there anything else in this area that could cause an oil leak? I notice two oil feed pipes just below the cover. The oil leak seems to be above these pipes but is it worth removing these at the same time and changing the O rings on the ends (if they have O rings to seal)?


The leak is serious enough that I cant use the bike until the leak is resolved, any suggestions would be much appreciated.


Thanks