You will learn a lot and have fun too. I have been doing this a while. Mainly do Echo motors. Used weedeaters and such, but, I do their saw motors too. I do make my own hubs and timing rings but buy CH ignitions. Mufflers from Ken Lambert. I buy new saw short blocks and go from there. When you are done with the saw motor you have a BME 44 or 50. All my conversions have tons of power. Good luck.