Just wanted to point out a side-effect from the following modification: Routing your oil vent hose to your air-box. If your WR450 is upside down for a period of time. (1-3 minutes), oil will drain out of the top of your motor into your air-box. I know this because it happened to me. I was trail riding one day when I crashed trying to go across the side of a steep hill. I ended up rolling to the bottom of the hill while the WR stayed where I crashed, but it was upside down. I climbed back up the hill, and shut the gas off, but then I waited for a minute for my friend to show up so he could help me pick the bike up. ( I was tired, it was muddy as hell, and the hill was really steep.) Anyway, we finally get the bike on it's wheels, I turn on the gas, and the WR fires right up. I was totally unaware of any problem. I ride for about an hour, and right when we get back to camp, I'm idling through the campground when the WR stalls and dies. Will not restart. Looking her over, I find that my air-box is about an 1/8 full of oil, and my air filter is SOAKED in oil. I clean her up, change the air filter, and top her off with fresh oil. (only lost about 4-5 ounces). She fires right up and ran fine. Have put about 10 hours on her since then with no problems. She's running great. I left the mod how it was. IMO, this side effect is pretty small compared to having water sucked into your motor. Later.