As mentioned earlier, I would put it back on and run it a bit. You can ck to see if the boosters are dripping and turn the adjustment screws to see how they respond. After you've run it just pull the carb off to ck the power valve. The power valve doesn't know if it's upside down or right side up. The fuel won't drain back from the cover or evaporate if you flip the carb over. If there's any wetness under the cover the power valve is blown.