Due to EPA and California Air Resources Board emissions regulations, Walbro is no longer allowed to produce or sell carburetor adjustment tools. Carburetor adjustment tools continue to be available; however, they are only available through authorized OE dealers or from the Original Engine Manufacturers. Walbro’s official disclaimer reads as follows: A Walbro tamper-resistant adjustment system […]
What was once a standard one turn setting for both the idle and high speed needle on our diaphragm carburetors has evolved somewhat over the years. With the emphasis on more lean and clean running engines, our carburetors are required to meet standard parameters. These leaner and cleaner engine requirements have required calibration changes that […]
Setting of the metering lever height for a diaphragm carburetor is one most important adjustment to be made in a diaphragm carburetor. The metering lever’s functionality starts with the atmospheric pressure entering from the vent hole in the metering cover. This atmospheric pressure forces the metering diaphragm assembly down while the low pressure (vacuum) under […]
