so much anger here.yes i do have a da 50 that runs inverted perfectly.as well upright.im sorry you have problems with yours.was it new or used when purchased.there may be the problem.thanks for the carb number (yarom) as i have seen many china engines at the field with cheaper walbo carbs not working correctly.putting this carb on has solved there problems.would be great if these forums were left to helping and advising instead of bashing.