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Assuming you mean the sediment bowl, only when you see a buildup of sediment in the bottom of the bowl. If you see a line across the bowl, this may be the interface between water in the bottom and gas at the top. This also indicates a need to clean. My experienced hay hand finished raking a field with the choke mostly pulled out to get the tractor to run. He had removed the carburetor bowl twice to try to clean it out. The sediment bowl was completely full of water. Tractor ran fine after I dumped it. He was a little embarrassed. To clean the sediment bowl, use a little carburetor cleaner to clean the threads, if necessary. Shut off the fuel (L shaped lever at top of housing), unscrew nut under bowl, remove and clean. If it has not been off in a while be ready to replace the gasket. If it is a glass bowl try not to drop it (very easy to do). Reinstall and turn the gas on. If the carburetor is full of gas the bowl may not fill up. Don't worry, it will after you start it. Rinse the spilled gas off with water before you start the tractor. In the field you can use a cup full from your water jug. It rinses off pretty easily. Just a little will not cause a problem, but gas spilled on the starter-mounted switch can be a big problem if not rinsed off. If you can let it set for a couple of hours all the flammable components will be gone even though the smell is still there. I burned one C by not rinsing it off. Almost had the fire out when the fuel bowl broke and caught the rear tires.
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