I have the strangest problem and nobody can tell me how it is happening. When I check the engine oil in my 2006 CRF450 before I ride, it is perfect. When I come back from riding it is higher. I am actually gaining oil while riding. How can this be?
You have a blown counterbalancer seal. When the counter balancer seal goes out, oil from the transmission is drawn into the top-end. We’re willing to bet that as your engine oil quantity is increasing, your transmission oil level is going down. Honda is the only four-stroke that can have this problem, since Yamaha, Kawasaki, Suzuki and KTM use shared oil for the tranny and top-end.