i heard you can get a bigger spur by i think hpi or something, you have to mod it a bit but it fits. i think wade knows. That or you can get a 11 or 12t cb
http://www3.towerhobbies.com/cgi-bin...?&I=LXNZ41&P=7
http://www3.towerhobbies.com/cgi-bin...?&I=LXNZ42&P=7
and im pretty sure its this bearing for it http://www3.towerhobbies.com/cgi-bin...?&I=LXM766&P=M
but if you get a smaller cb im pretty sure you have to shim the motor up, juts so it can still mesh.