I recently changed the piston rings and gaskets on my fj180vkai. I started it back up and it sounded really weak and crappy. I twisted the two screws on the carb hoping it would make a difference and the motor continued to sound the same. So, I left it running outside. After about an hour of sitting idle and sounding like crap, it suddenly reved WAY up. Really loud. It scared me and I ran outside and shut it down. I am guessing the motor was maybe breaking in the rings and is good to go now? However, I am guessing the carb needs to be adjusted now because it sounded like the idle was sky high. Just wondering what the best way is to adjust the carb and make sure I am doing it all right.