Make sure that air box is sealed tight. About the only way to do so is to unbolt it from the cart. You may think it is but 1/2 the time its not. It will cause the cart to stumble at full throttle. Also change your fuel filters. If you ever ran your cart out of gas, it picks up all the dirt in the tank and will partially plug up the filter or completely plug it.
I need to clean my carb and change the fuel filters on mine before next weekend so I know it is running its best for the Bonanza.
Cleaning the carburetor is not that hard. Tear it completely down and when you clean it, use compressed air and carb cleaner making sure there is no dirt left in the bowl. Use something like a needle to clean the jets. (the small holes on the side of the tube that goes straight up in the carb. Also pay close attention the the needle seat. Make sure not a spec of dirt is around it. When re-assembling, turn the low idle adjustment screw all the way in, then back off 3/4 turn. Just take your time, Its not all that hard. The first time I did it, I had Terry from BU on the phone with me and he was nice enough to walk me through every step.