I thought any 40-46 should fit then I read this little addendum on
http://www2.towerhobbies.com/cgi-bin...&I=LXJDH3&P=RO
*Because the .46LA dimensions are different than a bearinged engine,
it will not work in this plane unless modifications are made. You
will need a different engine mount. Depending on which engine
mount is used, you may need to add aprox. 1/4" to 3/8" plywood
to the firewall to extend the prop forward enough to keep it from
contacting the fuselage.
If a Tower .46 is being use, you will need to use an muffler
extension. The Dubro 699 Muffler Extension DUBG1319 will work fine.