If you have a problem with a 60 degree carb motor stalling on take off you need to check the timing roller, the first picture the roller is incorrect, in the second picture the screw that is used to adjust the roller is marked, loosen the screw and move the roller until it touches the arm as indicated by the arrow.
The third picture is how the roller should be positioned.
All pictures are with the top round cover removed.
Roller in an incorrect position
Loosen screw, move roller as indicated by arrows.
Correct roller position.
Photos courtesy of Elgin