This morning I fired up the bike to test a new fuel map, and it started smoking. Right side valve cover gasket had a significant leak, very sudden, and it was getting all over the header. Bike has been parked for awhile while I made some mods to it. What I am trying to figure out is if this is common, or if something I did might have caused it. It is coming out with gusto every time I rev it, like spraying. The only recent modifications have been desmog and fuel map/PCV. I am not much of a mechanic and wonder if capping a vent hose on the cover left side maybe is related? It is a big enough leak that I don't want to ride it until the cover is pulled and new gasket and sealant put on.