We have a Johnson 15 hp motor Model #15R74S. Ran perfect for over an hour then began sounding like the motor was "bogging" down. Took motor to the shop and asked him to put a new fuel pump and rebuild the carb on it as well as find out what the problem was if that didn't correct it. He rebuilt the carb, put new fuel pump on... that didn't remedy the problem. Then he replaced the coil, condenser and it still wasn't running properly. He then told us (after 2 weeks) that after none of that solved the problem, he went back in the carb and found the main jet missing. I know nothing about motors, but tell me, how can a main jet be missing and the motor run perfectly for an hour or more??? After he told us this, I went and picked up the motor and he told me that he removed the new fuel pump and put the old one back on it..(later learned there is NO fuel pump on it whatsoever) What should we do? Thanks in advance for your help!