I have a 2008 Yamaha vx110 deluxe and I have always had the dealer service it. This year I decided to try to change the oil myself. I started by running it for 6 minutes in the drive way and then I checked the oil level, like it says in the manual. The oil level was really high so I pulled about 17 oz. out of the engine and got it down to about the Full line. The last time I had the oil changed was a year ago and I ran it about 20 hours last year like this. I saw somewhere overfilling the oil can cause a problem with the air filter or something. I would take it back to the dealer but obviously don't really trust them. Any thoughts on what to check? Thanks