We took the back cover off of our fuel pump that was held on with 4 bolts that took a 10mm wrench and found a locknut that also took a 10mm wrench. we held the slotted screw and loosened the locknut and turned the screw in 1/2 turn. now it seem to smoke a lot when we engage the rotor and when we throttle up but doesn't seem to have any more power. There is another round locknut off to the side that is round with a slotted screw in it. What did we do wrong?