Help, I have a Jack Moore built lt80 motor that runs strong. However lately , it starts right up and runs fine until it is warm. Then it stalls if I don't keep revving it up. If it stalls it will restart if I use the choke. All suggestions accepted

 

I would start by installing a new spark plug (even if it's not very old).

 

after you change the plug, check the float level, clean carb and line from gas tank. Check to see you get a good flow from your tank. After that CDI.

 

ARE YOU SEEING A TEMP CHANGE. HERE IN IOWA WE HAD TO STEP UP THE JETS TO MAKE THE 50S RUN RIGHT