Then you can see the water pump, but you need to pull the gear case off the lower unit to replace it. Once you disconnect the shifter, throttle linkage, stop button, and choke you can fight with the screws that hold the powerhead on and the gasket underneath that's probably stuck. Notice the carb tucked down in there on the left side where you can't reach it? If you have a "weedless" drive you need to pull the powerhead to get to the water pump, and you always need to pull it to get to the carburetor. You should be able to see the tag before pulling the motor - mine is a SUM-20. There should be a tag on the bottom of the carburetor, make sure you get the correct kit. My motor had a damaged flywheel when I bought it, someone tried to pry it off or use a gear puller - fortunately I was able to find a replacement. ![]() The carb on mine looked okay but the fuel pump diaphragm was stiff and wouldn't work at all.Īlso make sure you know how to remove the flywheel without damaging it a harmonic balancer puller is cheap at any auto parts store. Definitely print out the service manual and get an overhaul kit for the carb/fuel pump and at least one impeller because you won't want to pull it apart again any time soon. ![]() It's not too terrible to work on, other than the usual screws that can't be reached (slot head screws no less). I just went through a McCulloch 7.5, probably the same motor.
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