Leave it wide open for about a minute to see if it changes any. Let’s set the topend first since it’s the easier of the two. Choke or prime the motor until the carb is wet. Don’t confuse fuel/ air mixture with fuel/ oil mixture which refers to how much oil gets poured into each gallon of gas.įirst, screw in both lowend & highend needles all the way then unscrew to about 1 3/4 to 2 turns out each. Screwing them in reduces fuel flow which leans the fuel/air mixture. Unscrewing the needles on this carb increases fuel flow which richens the fuel/air mixture. The highend needle trims mixture at mid-range through full power. The lowend needle refers to the one that trims idle mixture mostly and affects mid-range mixture somewhat.
The most relevant parts have been included here in case the original gets relocated. See also membrane carburetor overview, Buyers guide for Walbro Carbs and Rebuild Kits Adjustment and correction of problems found on Walbro Carburetors
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