Dubro make a 4 stroke throttle linkage. I used one an LT-40.
Picture of 4 stroke in LT-40:
http://www.rcuniverse.com/forum/fb.asp?m=1963117
Dubro 4 stroke throttle linkage:
http://dubro.com/DUBRO2005CATALOG/DU...alog_5C89.html
There is nothing special about the Dubro linkage. It is just a collection of small parts:
http://www2.towerhobbies.com/cgi-bin...?&I=LXD939&P=7
A wire control rod bent in a U shape will work also. (It will extend out in front of the throttle,
then bend back toward the throttle.)