In some of that stuff, you can get over 50. Most "rapid blasts" are up to 40. There are times that you'll be beyond that, but it's not common. Those flats, in 5th flat-out are some of those times. I can rarely get the thing to hold in the powerband in 6th, unless it's a long, flat section. That's on the 2-stroke.
The 4-strokes, you can jam those bastards up into 5th and just pin it on straights, and it'll keep pulling and pulling. Some 4-strokes will hold 4th on the hill, but many need to downshift to 3rd. Those YFZ-450s will do it.
One of these trips, I'll get up to China Wall again, and get some vids from up there - that damn thing is SO steep... :eek: