Aloha JCE, just a suggestion those covers on the hi and lo adjustment screws were put there so consumer could not mess with carb adjustment, with a longnose pliers pull them off carefully .use a screwdriver turn hi an lo srews all the way in not to tight bring out both screws one and half full turn and work from there if machine continues tostall use lo srew turn till machine runs without stalling hi srew is for more power. aloha JCE try it and let me no ,if you werehere i would do it for you good luck and aloha SHANE