Yup the Honda CRF sprocket works..
Went for my first big boy ride in the Boise NF around Cascade and found with stock gearing 13/49 on my 13 250RR I had some gaps on the uphills between 2nd and 3rd , first and second..
So I called Canyon Honda for a 12 CRF 450 51 tooth steel rear sprocket 33$ .. works like a charm.. only trouble I had was getting the old one off with the star pattern and red locktite on all of them
I had to pick up some generic sprocket bolts from cycle gear which worked very well... and was able to use the stock chain for the 51 bets
Here are the pics:
JT sprocket
http://s265.photobucket.com/user/kevin_ ... 2.jpg.html
http://s265.photobucket.com/user/kevin_ ... 1.jpg.html
over the old sprocket
http://s265.photobucket.com/user/kevin_ ... 4.jpg.html
on the bike:
http://s265.photobucket.com/user/kevin_ ... 8.jpg.html