Re: bought a replacement engine and it wont start.
did it ever run? you said it ran good but you broke exhaust bolts and then bought a new motor? mine wont start with out the choke 9/10 closed and full throttle at 70 deg in so cal. if you are sure theirs no spark [no kill switch hooked up] take the plug out grap it tight and have someone turn the motor over that will answer your spark question.