Hey guys I ran into a new issue with my bike. I've been running my 08 490 big bore all of the last week but the other day blue smoke started spitting out of my exhaust... it ONLY does at when i let off the throttle.. not when i am on the throttle. I'm running 91 octane premium fuel and there is no way that it could be mixed with oil in anyway before filling my bike up. I just cleaned my air filter and re-oiled it a few days ago, is it possible that i over oiled it and filter oil can be getting in through my intake? Is it safe to assume that i need to replace my piston rings? I do not know how many hours are on the piston itself but I did have it replaced just over a season ago maybe a season and a half.. I do not race my bike i ride it leisurely but I am hard on it i don't putt around when I ride. Is it safe to say that while i'm pulling my top end apart that i might as well and replace my piston and rings together? And if that's the case then I want to replace my timing chain while i'm in there so where is the cheapest place to go for a new timing chain? The bike is parked until I can diagnose my issue and order parts.. frustrating to say the least but I hope I can get this fixed right away so I don't lose the beginning of summer for riding.. what do you guys think?