Man this is a great site. I ran across it the other day while searching for a little help with my JD 345. I hope someone can offer some advice cause I have done all I know to do. Here's the problem at wide open throttle the motor will miss for a split second and it does it at different times and not all the time. It is a 20HP kawi liquid cooled and has 576 hours on it. Here's what I've done, removed and cleaned carb, changed fuel filter, checked gas cap, replaced air filter, replaced spark plugs and checked fuel pressure. Pressure seems to be okay. Not sure what it's suppose to be. When the mower is running it smells like it is running rich. Any help would be greatly appreciated.