bike is back together and running perfect. I rotated the engine and replaced all the top end gaskets with a nice cheap buell set. came with updated metal base gaskets too. replaced piston rings and honed cylinders. installed new tps, o2, and cylinder head temp sensors and put it back together. bikes running better than ever. and yes the 21 code is still there. I think chkinstrip mentioned the prob could be the temp sensor on page one didn't he? I noticed the rear cylinder go really hot and that's why the whole thing was starting to seep oil as well. def feel like the right side scoop is a good adition here. and the header was white inside on the rear cylinder too! the new o2 sensor probably helped too. thanks for everyones help