Tech Tip: Over The Wintervdl
To store your carburetor over the off-season, drain the bowls by removing one of the bottom bowl screws and pumping the pump circuit completely dry. This will generally suffice, but an extra margin of safety can be obtained by pouring a mixture of leaded racing gas and Marvel Mystery Oil into the carburetor through the vent tubes, pumping the solution through the pump circuit, and then draining out the excess. Even better: run the same mixture through the entire engine, lubricating rings, valves, and cylinder walls, as well as the carburetor. If you use oxygenated fuel, alcohol, or any blend of ethanol, this maintenance step should be taken frequently through the season to combat corrosion. Now, this process will smoke you out of the shop, but it will help maintain the health of your fuel system.