Its in rough shape, it appears to have seen salt water use but it runs fine out of the water. Not so much that I care to fix it, it's most likely going to be a donor motor to the other one, but how would water get up the exhaust into the cylinder on one of these? The motor is only in the water about a foot, it takes less than half a pull on the rope to lock up the motor, if I pull the plug with the motor in the water it slobbers water out the plug hole when pulling the rope. This is an air cooled motor, how or where can water be getting up into the motor? I pump out the water, and it starts and runs fine out of the water, if I hang it in a barrel, it fills the cylinder with water and locks up. It had me puzzled at first, it ran fine, on 24:1 chainsaw mix, I hung it in a barrel and it tried to start it and it seized up. It'll start and run fine out the water, but locks up in the water. The main water pump is under that plate.I was given two motors yesterday, one runs but has a bunch of missing bolts and screws on the power head, the other runs but dies in the water. The bail-o-matic pump is on top, visible here. 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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