i have a (91?) fa 50 and i thought i was the only one in the world with one. i was so happy to see that there are others out there. i have owned it for 10+ years and it has run so-so since i bought it. i have recently drained and refilled gas and oil reservoirs, and gear box, and removed and cleaned the carb inside and out. i put a new air filter on it and a plug, and i can't get it to run. i need help.