I just put mine in the shop for this reason. This 800 trail is only 2 months old and it happened once and I thought it could be oil that dripped off the filter except that oil is blue. I also thought maybe it's cause I stuck my hand over the intake tube curious how much flow it had and also the oil on the stick was just a hair over the full mark. 1st time the tube on bottom of canister was about 1/2 full, but then it didn't do it for several weeks and one day I rode for about an hour on flat ground and never got over 10 mph, came home and the clear rubber tube was FULL! They say it's "normal" when you get the machine at certain angles but I didn't get it at any weird angles this 2nd time. They want to charge me $250 to say it's normal, I told them I'm going to keep an eye on it and study some more because this does not seem normal. If it's a warranty issue I want it fixed, I didn't spent alot of money for a machine that's constantly spitting it's oil out backwards