Did you rebuild the carb before putting the motor back together? How long has it been since the last rebuild? Always a good idea to rebuild your carb if you are building a new motor or if its been a few years. Dont guess on your engine timing either. Go to your local auto parts store and rent a timing light and KNOW the timing is right.
Also, are you using fresh gas? How long has that gas been sitting in the tank since last fill up?
