Originally Posted By: ls1mike
That is the one. Thanks!
Ok I've worked on that one. The neighbor next door has one on her Craftsman mower. At the bottom of the page in that link is that blue plastic main nozzle. The way you remove that is by pulling out the throttle plate first and then pulling out the throttle shaft. The throttle plate pulls out easy with nose pliers. After that, you can stick a flat blade screwdriver down in the venturi and push the main nozzle out from the inside. After you get the main nozzle out, then you can check to see if the holes in it are clear and also check the condition of the O-ring. If the holes are blocked, the engine will run lean. If the O-ring is old and dry, that will cause fuel to leak past it causing the engine to run rich. Either of those two conditions will cause surging. You also should check the condition of the primer bulb. If it's old and dry, it might be cracked. A cracked primer bulb will suck in air and cause the engine to run lean. And besides that, you have to remove the primer bulb to replace the primer check valve anyway.
