Lately I am experiencing big vibration in my WR450F '05. It's so hard that blurs my vision if seated. When I stand it disapears. Bar was changed from Renthal stock to a Pro Taper Fat Bar and the vibration at hands reduced and I don't lost my fingers habilities anymore. But the excessive vibration that blurs my vision is anoying me a lot. Any clue, other than check the nuts and bolts what I already did ? It happens at mid to high revs. Low rpm don't show any problems. I cut the gray wire and am using high octane gas.