So, rode on Thursday no problems. Gave the bike a thorough cleaning today then started it to let it warm up for an oil change and noticed oil leaking from the filter cover, shut it down. On further inspection oil is also coming from the largest of the breathing tubes and maybe from the seam at the bottom of the head. Lost about 3 ounces. Details: 2006 450X, it was cold -3C, hard starting cranked for a while battery went low so I kicked it a few times then boosted it. It did have one sharp backfire before it started but upon boosting the battery it started right up. It seemed to run fine before I shut it down but I did notice the exhaust pipe got red fast with the choke on. Any ideas?