GZ250 Smokes on cold start, stops smoking after running

[DBG]

My bike spews blue/white smoke every time i start it after letting it sit a while. After a few minutes, the smoking stops and it purrs like a kitten. I've done some research on the issue, and it looks like it might be a sticking valve or worn valve seals causing oil to drain into the cylinder after i kill the engine. Then upon start up the oil that drained into the cylinder burns off in a cloud of ninja smoke. I ordered some new valve seals and plan on replacing them later this week. I'm also going to soak the entire cylinder head, inner block, etc., in Seafoam to get rid of any excess carbon. If this doesn't fix it, I'll move on to checking the cylinder walls and piston fit, etc. (engine has good compression already). If anybody has any suggestions, send em my way. I plan on posting the results once all is said and done.