Remove those white and red limiter caps so you can access the Low and High Mixture screws. There is hope for this carb, if the check valves arent shot. Strong solvents and high psi compressed air will ruin them and the fuel Will NOT flow thru the carb properly. If ya pulled a welch plug out, try resealing it with fingernail polish. Sounds crazy, but dries hard and tough...make sure to let it dry well. Typical adjustments on a Zama diaphragm carb are L and H mixture screws turned out 1.5 turns from light seat.