i can honestly say nomy first rebuild/ assembly i had watched /and read enough to know a. when intake is off to have galley covered b. when carb off plug intake ( rag, tape) and to be sure all parts and fasteners accounted for. not saying nothing bad about so dont think i am . just knew possible out comes if i screw(ed) up and the prostpect of thoughing money away was never something i wanted to through in on my learning curve