Walbro carburetor setup

More Info. Impulse Pumps. Click Here for Parts Lookup. Featured Products. Snap-In primer assembly. Restore primer function with a new primer assembly. Looking for a Carburetor or Parts? You will then see that part number and its list price or replacement. Click on the Walbro Part Number. To order from our On-line partner, click the Order Parts box now. The high-end needle adjusts the fuel and air mixture for when the engine is operating at medium to full power.

The low-end needle adjusts the mixture for engine idling up to medium power. To begin adjustments, turn both screws clockwise until they are tight. Then, unscrew both screws roughly two complete revolutions. In order to precisely set the screws, start the engine and allow it to warm up for a few minutes. To set the high-end needle, squeeze the throttle all the way open.

Then, screw or unscrew the needle until the engine is running at peak revolutions per minute. Adjust the low-end needle until the four-cycle sound ceases.