2005 Honda CRF450X 

Hey, so sorry for such a late response. I'm 5'11" and feel very comfortable on the bike.

Wow, I am so sorry it took me so long to see your question. I didn't have any transmission issues with my 05. I did find that it seemed a bit sensitive to oil type/brand and found it to shift smoother using the Honda Red bottle transmission specific oil.

I sold it locally, sorry. I should have mentioned that in the video if I didn't. Thanks for asking.